System Integration

This session focuses on **Reasoning for Search Systems**, featuring two speakers: **Alex Egg** from **Adyen** and **Mohanna Hoveyda** from **Radboud University**. **Location:** Science Park 904, Room C3.161 **Date**: Friday, March 27 **Time**: 16:00-17:00 **Zoom** **link**: [https://uva-live.zoom.us/j/65011610507](https://uva-live.zoom.us/j/65011610507) Details below: **Speaker #1**: **Alex Egg** from **Adyen** **Title**: Dense Retrieval for Identity: Real-Time Entity Linking in Payments **Abstract**: Modern payment platforms must link billions of transactions to the correct shopper identity in real time. Traditional solutions rely on rule-based logic over identifiers such as card hashes, emails, or device fingerprints, but these approaches struggle when identifiers are incomplete, inconsistent, or shared across multiple individuals. In this talk, we describe how we reformulate customer event linking as a dense retrieval problem, where transactions act as queries and shopper identities act as documents in a vector search system. Transactions are encoded using a pretrained neural embedding model fine-tuned with contrastive learning, and incoming transactions are matched to shopper identities via approximate nearest neighbor (ANN) search over billions of shopper embeddings. We will discuss the representation learning challenges that arise in this setting, including learning identity signals from partially observed identifiers and aggregating transaction histories into shopper representations, as well as the system architecture required to support real-time retrieval at scale using hierarchical routing, vector compression, and distributed ANN search. **Bio**: Alex Egg is a Research Scientist at Adyen with a background in reinforcement learning. He previously worked on RL and LLM research at Meta, eBay, and UCSD. **Speaker #2: Mohanna Hoveyda** from **Radboud University** **Title**: The Reasoning Gap in Search: Overview of Current Paradigms and a Neurosymbolic Solution **Abstract**: Information retrieval has long focused on ranking documents by semantic relatedness. Yet many real-world information needs demand more: enforcement of logical constraints, multi-step inference, and synthesis of multiple pieces of evidence. Meeting these needs turns retrieval into a reasoning problem. In this talk, we first overview the current landscape of reasoning approaches applied or adaptable to IR from the broader AI research, along with a framework to help compare and relate these approaches for future research. We then present OrLog, our neuro-symbolic retrieval solution that addresses the reasoning gap for logically constrained queries. OrLog decouples predicate plausibility estimation from logical reasoning: an LLM provides plausibility scores for atomic predicates in a single generation-free forward pass, from which a probabilistic reasoning engine derives the posterior probability of query satisfaction. Evaluated across multiple backbone LLMs and logical constraint types, OrLog significantly improves top-rank precision while reducing token usage by approximately 90% per query-entity pair compared to LLM-as-reasoner baselines. **Bio**: I am Mohanna, a PhD student at Radboud University. My research focuses on adaptive orchestration in multi-agent search systems using reinforcement learning, and on developing reasoning methods that require less compute. **Counter:** SEA Talks #301 and #302.

**DDSCC Meetup 7** 📅 **Datum:** Vrijdag 27 Maart 2026 🕐 **Tijd:** 12:30 – 17:00 📍 **Locatie:** Rubicon Cloud Advisor, Leusderend 36, 3832 RC, Leusden **Wat kun je verwachten?** **Agenda** * 12:30 – Inloop met koffie en lunch * 13:30 – Opening door DDSCC * 13:45 – Introductie door Rubicon Cloud Advisor * 14:00 – Jasper Oosterveld: With Great Power Comes Great Labeling: Sensitivity Labels in de Praktijk * 14:45 – Pauze * 15:15 – *Jeroen Bijdevier:* Je omgeving op orde voor veilig en optimaal Copilot gebruik * 16:00 – Ronde tafel gesprekken * 16:30 – Borrel & netwerken (tot 17:00 uur) **Session description:** **Jasper Oosterveld - With Great Power Comes Great Labeling: Sensitivity Labels in de Praktijk** Veel organisaties hebben inmiddels sensitivity labels geïmplementeerd als basis voor data security in Microsoft 365. Maar zodra je voorbij de basis komt, ontstaan er nieuwe vragen. Hoe ontwerp je een werkbaar labelmodel? Hoe voorkom je dat gebruikers verdwalen in te veel labels? Wat betekent labeling voor Teams, SharePoint, Data Lifecycle Management en Microsoft 365 Copilot? En waarom gedraagt het platform zich soms nét anders dan je verwacht? Tijdens deze interactieve sessie deel ik mijn praktijkervaringen met sensitivity labels: keuzes die goed uitpakten, dingen die ik achteraf anders zou doen en de frustraties die je alleen tegenkomt wanneer je labels écht gaat gebruiken in productie. Dit is nadrukkelijk geen theoretische sessie. Neem je eigen ervaringen, uitdagingen en meningen mee, zodat we samen praktijklessen kunnen uitwisselen en ontdekken hoe we sensitivity labels effectiever kunnen inzetten. **Jeroen Bijdevier - Je omgeving op orde voor veilig en optimaal Copilot gebruik** Copilot ziet het verschil tussen achterhaalde en recente informatie niet. Die zal je dus een beetje moeten helpen. Rechten zijn vaak niet (in detail) op orde. Manueel deze zaken vinden is lastig en tijdrovend. Natuurlijk wil je rapportages hebben van het gebruik. Ergo dataveiligheid op orde en inzicht in het gebruik met Purview.

Ben jij gefascineerd door de wereld van hacking en cybersecurity? Goed nieuws! Wat ooit een exclusieve serie workshops was voor studenten van NOVI, is nu toegankelijk voor iedereen met een passie voor hacking. 🚀 **Hack Friday** is jouw wekelijkse dosis cybersecurity praktijk. Elke vrijdagochtend duiken we samen in de diepe, duistere wereld van een nieuwe machine of challenge, onder de deskundige begeleiding van een van de cybersecurity experts van NOVI. Het is de perfecte manier om je skills te testen, te verbeteren en iets nieuws te leren in een vriendelijke en ondersteunende omgeving. 🛠️💻 ### Wat heb je nodig? * **Een werkende Kali Linux installatie**: Zorg dat je klaar bent om de uitdaging aan te gaan met je eigen Kali Linux setup. * **Een nieuwsgierige geest**: Heb je zin om te leren en uitgedaagd te worden? Dan pas je perfect in onze Hack Friday! ### Waarom meedoen? * **Leer van de besten**: Onze cybersecurity experts staan klaar om hun kennis te delen en je door de challenges te begeleiden. * **Wekelijkse uitdagingen**: Elke week bieden we een nieuwe machine of challenge aan, zodat je je vaardigheden kunt blijven ontwikkelen. * **Ontmoet gelijkgestemden**: Sluit je aan bij een community van enthousiaste hackers en cybersecurity professionals. ### Details: * **Wanneer**: Elke vrijdagochtend * **Waar**: op locatie in Utrecht * **Voor wie**: Iedereen met een interesse in hacking en cybersecurity, van beginners tot gevorderden. Ben je klaar om je hacking skills naar een hoger niveau te tillen en deel uit te maken van onze groeiende community? Sluit je dan aan bij Hack Friday en daag jezelf elke week uit met nieuwe en spannende cybersecurity avonturen! 🌟🔒 Registreer nu en laat zien wat je in huis hebt! Wij kunnen niet wachten om je te ontmoeten.

Join us for a fun Friday night of improv theatre in English. Play, laugh, and meet new people in Utrecht during this welcoming drop-in workshop led by Burgert Kirsten, one of Improv Utrecht’s professional trainers. Everyone is welcome. You do not need any acting experience, and you do not need to be fluent in English. Many participants are not native speakers. Each week, several people join for the very first time, alongside regulars who come back again and again. Expect a group of around 12 to 22 people in total. What to expect Meet a mix of international and Dutch players Learn the basics of improvisation, a valuable modern skill Play fun and accessible theatre games Laugh a lot and surprise yourself along the way Practical information Doors open between 19:50 and 20:00. Please enter together with the group. The entrance is on the side of the building, via Troelstralaan. Workshop time is from 20:00 to 22:00. Full details can be found at [https://bit.ly/iudropin](https://l.facebook.com/l.php?u=https%3A%2F%2Fbit.ly%2Fiudropin%3Ffbclid%3DIwZXh0bgNhZW0CMTAAYnJpZBExYzVUWUpNcUx3Qmxyc0tCNnNydGMGYXBwX2lkEDIyMjAzOTE3ODgyMDA4OTIAAR6Uacch2zhjkNy6h1oNgRxFH9V9xdWoET38TkCXK39CyqxYEjQmirGViM_qlw_aem_hJkW5L3WHAO-pVZVHN1c3w&h=AT2S7AyQGOOxCA4y6M0NO7B-v3mSsYPTMqxJoyJHW3Wu4TVusm_lz92s5ru9B6DhWOMOy4IwE72y9T569MBRbB3tPDcPKdnsSnjI9Ef1b-7Yp467m71KcHLeJGRXaJI9_bDbaRe4F93uFs00Rds&__tn__=q&c%5B0%5D=AT0toyw-m6q1Kl9A4pude9T05YHtdW_ajvYBWe_MixS8-d0JBdNz089yFCaZxIjsj41oPDYTZr-pLoVp3Nbw6oS2l-b59hWsbjVnOl__PH25Cx3iZDHpMxmtl8_kxDTepak27ZG-3b10bx8fSuh2QAJtRaEuxCrWtVE) After the workshop, people usually head together to the Irish pub O’Leary’s for a drink and a chat. How to sign up Please mark yourself as attending via our website at [https://bit.ly/iudropin](https://l.facebook.com/l.php?u=https%3A%2F%2Fbit.ly%2Fiudropin%3Ffbclid%3DIwZXh0bgNhZW0CMTAAYnJpZBExYzVUWUpNcUx3Qmxyc0tCNnNydGMGYXBwX2lkEDIyMjAzOTE3ODgyMDA4OTIAAR4aOuBKx2VBkJDoGyYCRHQXSTHuVoJHy0WS1bZAftQYuSLPcNgmTQeaBv4hpw_aem_5jJND0IPMoJD8mXqM4l2SA&h=AT2S7AyQGOOxCA4y6M0NO7B-v3mSsYPTMqxJoyJHW3Wu4TVusm_lz92s5ru9B6DhWOMOy4IwE72y9T569MBRbB3tPDcPKdnsSnjI9Ef1b-7Yp467m71KcHLeJGRXaJI9_bDbaRe4F93uFs00Rds&__tn__=q&c%5B0%5D=AT0toyw-m6q1Kl9A4pude9T05YHtdW_ajvYBWe_MixS8-d0JBdNz089yFCaZxIjsj41oPDYTZr-pLoVp3Nbw6oS2l-b59hWsbjVnOl__PH25Cx3iZDHpMxmtl8_kxDTepak27ZG-3b10bx8fSuh2QAJtRaEuxCrWtVE). If you can no longer attend, remember to remove your signup so someone else can take your spot. Please also send your contact details to Marieke at info@theatersportworkshops.nl so we can reach you if there are any changes or issues with the workshop. Price Suggested donation €10 to €20, payable in cash or via Tikkie. If you are not able to pay much, you are still very welcome. Pay what you can or what you felt the workshop was worth. Your contribution helps cover the room rental and the professional trainers. Curious about more? Check out our improv courses at [https://www.improvutrecht.nl](https://l.facebook.com/l.php?u=https%3A%2F%2Fwww.improvutrecht.nl%2F%3Ffbclid%3DIwZXh0bgNhZW0CMTAAYnJpZBExYzVUWUpNcUx3Qmxyc0tCNnNydGMGYXBwX2lkEDIyMjAzOTE3ODgyMDA4OTIAAR4aOuBKx2VBkJDoGyYCRHQXSTHuVoJHy0WS1bZAftQYuSLPcNgmTQeaBv4hpw_aem_5jJND0IPMoJD8mXqM4l2SA&h=AT0HQGS9N7lDDerT4Jh2s7yQZ3yqXcU3N7DHXcnh_ArhUbPBNnFc1Vs5ILLXJTm8W6M0qWOaOlvHeCdiG9IvYCgONK3G7Mx7YP3_ERn_wSRix-AtI5wPA8WvGq1ijPS5zLOaIIFzJ3kK6yajLPE&__tn__=q&c%5B0%5D=AT0toyw-m6q1Kl9A4pude9T05YHtdW_ajvYBWe_MixS8-d0JBdNz089yFCaZxIjsj41oPDYTZr-pLoVp3Nbw6oS2l-b59hWsbjVnOl__PH25Cx3iZDHpMxmtl8_kxDTepak27ZG-3b10bx8fSuh2QAJtRaEuxCrWtVE) Tickets for courses via [https://improv-utrecht.weticket.com](https://improv-utrecht.weticket.com/?fbclid=IwZXh0bgNhZW0CMTAAYnJpZBExYzVUWUpNcUx3Qmxyc0tCNnNydGMGYXBwX2lkEDIyMjAzOTE3ODgyMDA4OTIAAR7kmRsV6LQrIsZqtZLBNbCbr9_NHgu23lRTafAiyzXQMBjXirebJNUXyW7-Jg_aem_Ps3bRMMWxOjgfL78fqIL8w) Follow Improv Utrecht Meetup [https://www.meetup.com/utrecht-improv-theater](https://www.meetup.com/utrecht-improv-theater?fbclid=IwZXh0bgNhZW0CMTAAYnJpZBExYzVUWUpNcUx3Qmxyc0tCNnNydGMGYXBwX2lkEDIyMjAzOTE3ODgyMDA4OTIAAR4aOuBKx2VBkJDoGyYCRHQXSTHuVoJHy0WS1bZAftQYuSLPcNgmTQeaBv4hpw_aem_5jJND0IPMoJD8mXqM4l2SA) Instagram @improvutrecht Facebook https://facebook.com/ImprovUtrecht

Tickets: https://vorstin.stager.co/shop/default/events/111575211 Met de hoge opkomst én de ongekende energie in de zaal en op het podium bewijst dit concept keer op keer dat er in Hilversum behoefte is aan metal! Daarom is het tijd voor een nieuwe editie van METALCAFE Live in De Vorstin! Op 27 maart staat er metalcore en melodic hardcore op het programma, met optredens van Previse + Reality Spill + Sugar Spine Previse Wat ooit begon als een kleine coverband, die nummers speelde van hun favoriete artiesten (Polaris, Parkway Drive, Enter Shikari, Beartooth en vele anderen), groeide uit tot een band met een krachtig eigen repertoire. Ongeacht waar ze spelen, Previse zit vol energie en de bandleden geven alles wat ze hebben op het podium. Reality Spill Reality Spill is een vierkoppige metalcore band uit Overijssel. Sinds 2021 timmert de band hard aan de weg en hebben ze al meerdere releases en talloze liveshows op hun naam staan in binnen en buitenland. Eind 2024 verscheen hun tweede EP ‘The End of the World’; een nieuwe sound die naast de vertrouwde metalcore sound, uitstapjes maakt naar hardcore, electronica en pop-punk. Verwacht een gezonde dosis energie en chaos op het podium bij een show van Reality Spill! Sugar Spine Sugar Spine is een opkomende metallic hardcore band uit Nederland, die een meedogenloze mix brengt van hardcore, metalcore en deathcore. Hun sound schakelt moeiteloos tussen verschillende stijlen en laat duidelijke invloeden horen van bands als Stick To Your Guns, (early) Slipknot, END en Boundaries. Wat begon als een soloproject van vocalist Josh Muncke in 2021, groeide in 2023 uit tot een volwaardige liveband die in korte tijd het podium deelde met internationale acts zoals Jesus Piece, Breakdown of Sanity, Half Me en Misery Signals. Daarnaast werkte Sugar Spine samen met artiesten als Bleed From Within, Cabal, To The Grave, Distant en Born Of Osiris. Gedreven door pure wilskracht, authenticiteit en compromisloze energie laat Sugar Spine zien klaar te zijn om een blijvende indruk achter te laten in de metalwereld. Let’s raise some hell, metalheads!

*Since the guided meditations for this event are in Dutch, this description is too.* Wil je je drukke week afsluiten en ontspannen aan het weekend beginnen? Dan ben je geheel vrijblijvend welkom bij de vrijdagavond meditatie van [Jewel Heart](https://www.jewelheart.nl/). Deze meditatieavond heeft een licht en open karakter. De meditaties bestaan uit drie delen. We beginnen met het gewaarworden van je lichamelijke sensaties. In een korter deel twee doen we een loopmeditatie en in deel drie is er een eenvoudige, geleide visualisatie meditatie. Het geheel wordt afgesloten met een gesprek onder het genot van een kop thee, voor wie daar zin in heeft. 📍[Jewel Heart, Hatertseveldweg 284, Nijmegen](https://maps.app.goo.gl/D4FzqLbkaqs2JNDG8). Loop de oprit op en dan is de ingang aan je rechterzijde 🕒Zaal open vanaf 19.30 uur, meditatie van 20.00 tot 21.00 Je bent van harte welkom! Aan deze activiteit kun je per keer meedoen. Er zijn geen verplichtingen. Op vrijwillige basis kun je op de avond zelf een donatie doen. Kijk ook naar onze -[Open activiteiten](https://www.jewelheart.nl/nl/open-activiteiten/) -[Cursussen](https://www.jewelheart.nl/nl/cursussen-overzicht/)

**Join us for the third event at our new location: *The Social Hub Amsterdam City!*** **Tech Drinks + Pitching** is our regular meet-up for the tech and entrepreneurial community in the Netherlands, hosted in Amsterdam. Each month we bring together tech start-ups and individuals to have drink, pitch ideas, swap stories, share failed experiments, and plot a bit of world domination. **If you're interested in pitching during the event, please apply via this** **[form](https://airtable.com/appljL4XpOxxrhj9N/pagARYxyKd1i9mD4n/form).** Follow Tech Makers **[here](https://luma.com/techmakers?k=c)** for upcoming events, interesting people, and a little mischief *Looking for a cofounder? Try the matching platform we created, [https://findyourcofounder.nl](https://findyourcofounder.nl/)* *Register for free and let's boost entrepreneurship in the Netherlands !!*

* We **start at 12:15** at P&R Station Lunteren Spoorstraat 9, 6741 DE Lunteren https://maps.app.goo.gl/S1CFFxbpqNsP2VkR9 * Length: \~13 km (4 - 5 hr hiking) * What to bring: lunch, water, snack. * For whom: As always, sporty folks that like to combine social event with being active in nature. **Getting there by Train:** * To station: Lunteren https://maps.app.goo.gl/w5rTEBuumoxCgQ6U8 **Getting there by Car:** * Free car parking: at the P&R and in the streets Spoorstraat 9, 6741 DE Lunteren https://maps.app.goo.gl/tEt2gSJnAueVMNw86 **Note:** * Please **pay a small fee (3 euro)** to help us cover the (increased) yearly Meetup contribution of 240 euro. We'll ask you to pay before the start of the hike (can be on the day itself). No refunds, but in the unlikely event that hike would be cancelled and you already paid, you don't need to pay for your next hike. Thank you so much! Use the **safe link** here: https://betaalverzoek.rabobank.nl/betaalverzoek/?id=cqlYWv_MTpSjp2VkROXWhA * Keep in mind that the hike can be canceled when the weather is very bad (**always check the event before you go**). * If you RSVP 'yes' we expect you to show-up. Please do not cancel less than 24 hours before the hike. **No-shows** will lead to your removal from the group. Thanks for the understanding. * By signing up for this event, you agree to release the organizers from any responsibility and liability in all claims. As the participation is strictly voluntary and you freely choose to join, it is the responsibility of individuals participating to ensure that they are fit enough and have adequate coverage to protect themselves.

🏔️ Everest Update for the Veluwe Power Hikers We were preparing for a classic VPH high altitude expedition on top of the world. Unfortunately there is some disappointing news. Starting in 2026, Nepal is introducing strict new regulations for climbing Mount Everest. Climbers will now need to have previously summited a 7,000 meter peak in Nepal and must also submit mandatory health certificates. Because we cannot realistically summit a 7,000 meter peak and then climb Everest on the same day during our hike, I am unfortunately obliged to change the program. There is also another small complication. 1 April falls on a Wednesday, which makes organizing the expedition a bit difficult. After a poll in the WhatsApp group, we decided to move the date to **28 March** and climb the highest point of the Veluwe, **Signaal Imbosch (110 m)**. Even if it’s not Everest, don’t underestimate this hike: we will cover **22 km with about 350 metres of elevation gain** at a brisk pace. At this altitude, however, oxygen bottles are no longer recommended. Please update your RSVP if you can no longer attend due to the change. ⛰️🥾 **When and Where to Meet?** 10:10 sharp at Rheden Trainstation. ⏰ Please arrive on time, as we won’t be able to wait for latecomers. 🥾✨ https://maps.app.goo.gl/VaEtswyBps5awMoL7 **Where and When Shall We Rest?** We’ll take 2 breaks: * Lunch break in nature at Signaal Imbosch (110 m) with group photo on summit; 20 min * Snack and drink at Basecamp (80 m) where you can buy drinks and snacks; 30 min **Notifications:** * Technical equipment: avalanche transceiver (beacon), avalanche probe, and avalanche shovel (if you have them) * A compact lunch and water to share at the summit * The hike will only be canceled in case of severe avalanche risk (code 5). * If you plan to bring a companion, please ensure that they are also registered for the hike. * To be the first to get updates on new hikes, join our WhatsApp group! Feel free to ask for the QR code during the hike to easily join. * T-shirts are now available for €25, made from Fairwear-certified organic cotton with eco-friendly inks—sustainable, odor-resistant, and perfect for your hiking adventures (limited stock, available during the hike)! Let me know your size and I will bring one for you!

Welcome to the event page of the Walk & Talk in Arnhem Sonsbeekpark, taking place on Sunday March 29th, 2026. This event is a informal walk where we will connect again and perhaps meet some new people. It will be the first day of Daylight Saving Time and, fortuitously, *Zeldzaam Mooi Markt* is taking place in Sonsbeek. We plan to make a stopover here. Our event is free and open for everyone to join, including Dutch and internationals. **Practical information** \- The meetup of this walk is at **13:00 at Arnhem station, near Burger King**. We’ll start walking after 10 minutes. \- A walk like this is at a casual pace and usually takes about 2 hours\, including breaks\. We are focusing on an area\, not a specific route\. This gives us some room for suggestions of participants like when to have a few minute break\. \- We will take a coffee break at a café in between or afterwards if there's enough interest\. \- B\-YOU: Bring your own umbrella\, in case of rain\. If the weather is really unacceptable we will go to a café instead\, or cancel the entire event\. \- You can leave at any time you like\. **Sign up via Meetup OR E-mail** Please sign up for this event by RSVP on Meetup OR send an e-mail to **[urbanarnhem@gmail.com](urbanarnhem@gmail.com)** . Joining the event is free, but donations will be very appreciated. We are making costs to keep this group active on Meetup, so any (small) donation will go directly to keeping our page online. We hope to see you on this walk! \*\*\* **Disclaimers** \*SOCIAL MEDIA We might upload some of our photos and videos on social media. If you don't want to be recognized, please let us know. Our Instagram is: [@urbanrural.arnhem](www.instagram.com/urbanrural.arnhem) \*RESPECT & SAFETY Everyone partaking in the event must be treated with respect, and safety is being highly prioritized. Anyone violating this can and will be required to leave. Please contact the organizer if you feel something is wrong.

Een wandeling voor vaders die het zichzelf gunnen om even te willen uitwaaien én de diepte in willen. We lopen samen door de natuur, ontmoeten elkaar en delen wat er echt speelt — als vader, als man, in je werk of gewoon in je hoofd. Niets moet. Er is geen afleiding, alles draait om verbinden en inspireren. Onderweg doen we een aantal oefeningen, luisteren we naar elkaar en stellen we de vragen die er toe doen. Een ideaal moment om even tot jezelf te komen — die ontspanning neem je sowieso mee naar huis. **Past dit bij jou?** Je hoeft geen antwoorden te hebben. Alleen de bereidheid om eerlijk te zijn — naar jezelf en naar de andere vaders om je heen. **Wat kun je verwachten?** * Een kleine groep van max. 8 vaders * Een mooie route op de Veluwe * Goede gesprekken en oefeningen onderweg * Ruimte voor jouw verhaal * Koffie/thee en een snack na afloop Kortom: een wandeling waarmee je investeert in jezelf en je vaderschap. duur: 10:00-12:00 uur / investering is wat jij het waard vindt locatie: rondom Arnhem op de Veluwe

📍 Meeting point: **Nijmegen Lent Station** (⚠️ not Nijmegen Centraal!) 🗓 **Saturday, March 28th, 2026** 🕑 **14:00** After starting our journey through Dutch history with **Prehistory**, it’s time to move forward to the **Roman era**. And when we talk about Romans in the Netherlands, there is one unavoidable place to go: **Nijmegen**, the oldest city in the country, founded by the Romans as **Noviomagus**. We’ll start from the other side of the river Waal and walk towards the historic city centre, combining **river landscapes, green parks and urban history**. Along the way we’ll explore how the Romans conquered large parts of what is now the Netherlands, built forts and military camps along the Rhine (the *limes*), and established their first real city here. This walk is about **stories, traces and layers of history**—and about seeing Nijmegen through Roman eyes. 🥾 **The walk is about 5 km** and will take us through nature, parks and the city while discovering the Roman past of Nijmegen and the Netherlands. *** 🍺 **Post-walk drinks at Cafe De Zon** After the walk we’ll stop at **Cafe De Zon** to relax and have a drink together. It’s a perfect moment to chat, share impressions from the walk and wind down. If you like beer, you’ll also have the chance to try **Oersoep**, a local craft brewery from Nijmegen known for its creative and experimental beers. Of course, other drinks are available as well. *** A walk through **Roman history**, beautiful riverside views, and a relaxed drink afterwards — a perfect **Pastime afternoon**.

Give your still good laptop a second life instead of ditching it because Windows 11 says it is no good... Or you heard Linux is cool. If you have a backup of your data, that is great, else indicate that you do not, so we can help you. Do so in an extra message or to m10@m10tech.nl, else I don't receive your information. Geef je laptop die het nog prima doet een tweede kans in plaats van hem af te schrijven omdat Window 11 dat zegt... Of omdat je hoorde dat Linux gaaf is. Als je al een backup van je data hebt gemaakt is dat perfect. Of verwacht je dat wij dat doen? In dat geval graag aangeven hoe vol je harde schijf nu is... Doe dat in een extra bericht of aan m10@m10tech.nl, want de info komt anders niet door.

Zaterdag 28 maart houden hackerspaces in Nederland een open huis, ook Randomdata is van de partij. Hackerspace zijn locaties waar mensen met een technische, creatieve en nieuwsgierige mindset bijeenkomen om te werken aan projecten, elkaar te ontmoeten en te praten over onderwerpen die hen interesseren. Tijdens de open dag is het mogelijk om zelf te ontdekken wat hacken inhoudt en te zien wat er allemaal mogelijk is in een hackerspace. Tipje van de sluier? Iemands verbeeldingskracht is de meest beperkende factor! Iedereen is welkom om een kijkje te komen nemen tijdens deze jaarlijks terugkerende open dag. De deuren zijn geopend vanaf 13:00 uur, en om 17:00 is het dagprogramma afgelopen. Enkele voorbeelden van activiteiten die je kan doen: * Leren hoe kwetsbaar systemen zijn en wat daar aan gedaan kan worden. * Kennis opdoen over de juiste bescherming van je privacy en persoonsgegevens. * Zelf 3D-modellen maken en 3D-printen. * Een introductie tot Linux (neem hiervoor je laptop mee). * Een introductie tot Arduino of Raspberry Pi.

**First meetup of the Columbus AI Engineering group.** We’ll kick things off with a practical, beginner-friendly discussion on: **How LLMs like ChatGPT actually work — and how to build real applications with them.** We’ll cover: * what’s actually happening under the hood (at a high level) * why LLMs behave the way they do (hallucinations, prompt sensitivity, etc.) * how people are building real systems with them today * where things break in practice This will be a **short, informal talk (\~15–20 min)** followed by open discussion and Q&A. Whether you’re an engineer, builder, or just curious about how modern AI systems work, you’re welcome to join. No slides, no fluff — just real conversation about real systems. We’ll hang out afterward and get to know each other.

WQC has weekly Thursday night social nights at the Westerville Java Central. Come and grab a coffee and connect with the community: low stakes, chill environment, and tasty drinks. No registration is required; come as you are.

Come chat about Atlassian tools and best practices at the Nationwide Sunny Street Cafe and Breakfast is on Atlassian! Let's get the day started off with breakfast with your ACE Leaders! We're always excited to talk about Atlassian Products, share our knowledge and hand out swag! Come chat with us about new product news and anything you are working on within the Atlassian product stack. This is a great opportunity to come see what we are all about, hear new business news and share with other Atlassian users your questions and experiences. We'd love to see new and old friends come out to chat and learn about Atlassian! Agenda --- Moderators Kimberly Deal - Columbus Atlassian User Group Leader Kevin Stanley - Columbus Atlassian User Group Leader Hosted By Kimberly Deal, Atlassian User Group Leader Kevin Stanley, Chief Everything Greg Sprowls, Agility Lead --- Global Partner Atlassian (http://atlassian.com) Millions of users globally rely on Atlassian products every day for improving software development, project management, collaboration, and code quality. Partner Atlassian --- For over a decade, Atlassian customers have come together to network, share ideas, solve problems, and find new ways to use Atlassian products. Today, more than 15,000 people take part in Atlassian community events in more than 30 countries. --- Complete your event RSVP here: https://ace.atlassian.com/events/details/atlassian-columbus-presents-rise-and-shine-with-atlassian-downtownnationwide-22/.

**Connected Westerville Night of Networking** *April Edition: The Introduction Economy* You've been to the networking events. You've done the small talk. Collected the cards. Forgotten the names. And walked out feeling like you just wasted two hours of your life. The problem isn't you. It's the format. Most networking events put you in a room and tell you to figure it out. So everyone defaults to elevator pitches and business talk, and nothing real gets built. Here's the truth about networking that most people miss: Your network isn't just who you know. It's who thinks of you when they're talking to someone else. *That's* The Introduction Economy. And it only works when relationships are real. There's a reason people who come once keep coming back. It starts with seven minutes that feel nothing like networking. Then we open it up. Free networking. More conversations. More momentum. This is a room full of corporate professionals, entrepreneurs, business owners, creatives, and career builders in the Westerville and Columbus area. The mix is the magic. You might never do business with everyone you meet tonight. But someone in this room will think of *you.* **By name**. So, the next time someone needs exactly what you do, you get the recommendation. **April 14th. RSVP now.** **When:** Tuesday\, April 14th \| 6:15 PM \-\- 8:00 PM **Where:** Vineyard Community Center \| 6000 Cooper Rd\, Westerville\, OH 43081

The Fellowship of the Star Schema: Transforming OLTP Data for Power BI One does not simply build reports on OLTP data. Join us on an epic journey from the depths of raw, normalized tables to the shining halls of a well-modeled star schema fit for Power BI greatness. We will demystify the differences between OLTP and OLAP, walk through star schema vs snowflake (and why Power BI has a clear favorite), and show you the compression differences between normalized and columnar storage that will make you never look at an OLTP model the same way again. We will cover the different types of dimensions, when to use them, and how to handle Slowly Changing Dimensions without losing your mind. You will leave knowing exactly how to identify a bad model, how to convert OLTP data into a clean star schema, and how to forge relationships that rule them all. Whether you are a data wizard, a curious hobbit, or somewhere in between, your models will never be the same.

Christians in Tech is a community at the intersection of faith and technology. Our meetups are designed to spark meaningful conversations, promote knowledge sharing, and encourage growth—both in your career and your spiritual walk with God. Whether you're an experienced professional or just starting your tech journey, CIT welcomes you. Our Website [https://linktr.ee/citcbus](https://linktr.ee/citcbus) Sponsors and Partners * Improving (Venue Sponsor) * Bethel World Prayer Center (Fiscal Sponsor) * Fruits & Roots (Coffee Partner)