Smart Sensors

Relaxed day a the nudist beach of the Maarsseveense lake near Utrecht. Let’s get this group going and enjoy the nice weather! 😎☀️🏊‍♂️

\# This meetup is around a third\-party organizer\, Focus Filmtheater\. You can either purchase your ticket online or right before the session\. **Seats are numbered**. # **Title**: Mama’ku **Language**: Dutch **Subtitles**: English **Length**: 75 min **Director**: Sven Peetoom, Aldo Agaatsz **More info**: https://www.focusarnhem.nl/agenda/english-subs-mamaku/ **Ticket link**: https://www.focusarnhem.nl/tickets/146153/ **Synopsis:** The new documentary by Sven Peetoom (*Tussen Wal en Schip – Geruisloos Indisch)*. An intimate film about choreographer and dancer Cheroney Pelupessy, who makes the journey to Indonesia for the first time together with her mother in search of a hidden family history. **How it works**: I will be at Focus around 18:30, where we can meet before the movie starts. You can message me to find us. Screening starts at 19:00. After the movie, we can have a drink together. Hope to see you soon!

Spots are limited: [https://tickets.voxxeddays.com/event/workshop-victor-rentea](https://tickets.voxxeddays.com/event/workshop-victor-rentea) **Build faster, smarter software with AI.** Join an exclusive, fully catered workshop with Victor Rentea on Agentic Engineering in a small, focused group of engineers. **Upgrade your development workflow to 2026.** A hands-on day on AI Coding Agents: prompt & context engineering, multi-agent orchestration, spec-driven development, and self-improving skills. Learn how engineers reach 2x–10x productivity and what it takes to get there. **For:** all engineers (backend, frontend, QA, data, ops) **Bring:** laptop with Claude Code + subscription (Pro is enough) **The agenda of the day** **Introduction** * LLM Fundamentals: Predictions, Tokens, Context Window, Compaction, System Prompt, Model vs Agent Harness * AI Pitfalls: Sycophancy, Hallucinations, Attention Dilution, Knowledge Cutoff, Premature Fixation * MCP Tools – best-of **Context Engineering** * Evolving a Token-Efficient Project Memory * AI Context Sharing across repos, teams, and company * Skills and Custom Agents that self-improve * Token-Efficiency Tricks: context hygiene, DRY, grep-logs antipattern **Prompt Engineering & Orchestration** * Prompt Engineering – does and dont’s * Brainstorm, plan & generate a non-trivial change with AI * Multi-Agent Orchestration Patterns: handover, reviewer, orchestrator, advisor,… **AI Guardrails & Security** * Functional Guardrails with State-of-the-art Acceptance Tests * ⁠Code Quality Guardrails AI cannot circumvent * ⁠Architecture Guardrails & Exact Summarisation * APIs, C4 Model, sequence diagrams * AI Supply-Chain Attacks Attacks and Agent Isolation Techniques **Date:** Wednesday, July 1st (09:00 - 17:00) **Location**: Utrecht (venue TBA) **Price**: € 395,- (incl. lunch & drinks) Spots are limited: [https://tickets.voxxeddays.com/event/workshop-victor-rentea](https://tickets.voxxeddays.com/event/workshop-victor-rentea)

Hi all! 🙂 On Wednesdays we welcome you to practice languages! If you want to practice a specific (uncommon) language, please send us a message so we can find some conversation partners for you on our mailing list! We hope to see you in Café Marktzicht! In the last year we had tables for the following languages: * Dutch * English * French * Italian * Spanish * Turkish\* * German\* * Portuguese\* * Danish\* * Norwegian\* * Russian\* * Arabic\* * Chinese\*\* * Japanese\*\* * Indonesian\*\* * * Most likely, but not every week present. \*\* - Rather rare ;-) If your language is not in this list, please let us know! We have a large database of Language Cafe visitors speaking 56 different languages! We might be able to connect you with a person that does speak the language you want to practice. In case you are not in our database yet, please use this form: http://goo.gl/forms/oSCn9Dn8m8

**When:** Wednesday\, July 1st \| 🕒 Doors open at 19:00\, battle starts at 20:00 **Where:** De Ping Pong Club, Utrecht **Damage:** €4,07 (Buy your tickets in advance as spaces are limited! Secure your spot directly with the venue [here](https://shop.weeztix.com/37dc63d6-519c-11f0-a9cb-7e126431635e/events?shop_code=5rn36dck)!) **The Vibe:** I checked out De Ping Pong Club last week—it is an awesome location! They even have board games if you need a break from the action. I played there recently outside of a tournament, and let me tell you about the "athletic" standard: if you can hold two beers at the same time, you are officially qualified. This is not the Olympics, this is [around the table](https://depingpongclub.nl/agenda/). Leave your sports watch at home; this is a purely social event where your actual speaking time will easily outlast your playtime. **Pro Tip:** There are bonus points for costumes and alternative, non-paddle equipment. Fry-pans, textbooks, or flip-flops? Bring it. **Essential Training Routine:** If you actually want to take this seriously and lift the trophy, you *must* complete this strict two-step preparation: 1. Watch the [Balls of Fury Trailer](https://www.youtube.com/watch?v=HXR_NLDMUk8&t) to master the illegal underground table tennis mindset. 2. Blast [Armin van Buuren's Ping Pong](https://www.youtube.com/watch?v=Z8V5GfFeUDs) on repeat to get your hand-eye coordination synced to 138 BPM. **P.S.** Who is willing to play in my team **"ExBats"**? (Yes, a terrible pun merging "Expats" with *bat*, the Dutch word for racket). Drop a comment below if you're in!

Welcome to our Volleyball community !! 🏐🎉 We are a community of volleyball enthusiasts who want to enjoy the game, improve their skills, and meet new friends. Our open play sessions offer a friendly, social environment where everyone can get some practice and have fun. Our sessions consist of mixed level play, however intermediate volleyball knowledge is mandatory. We try to have a balanced levels per team to ensure smooth play. If you aren’t familiar with basic volleyball rules and have no experience, sorry to say, but it's not your group. ❗❗ Meetup recently pops up their subscription option after you click on RSVP— you can dismiss it by clicking the "X" in the top left corner. ✅ RSVP & Attendance Attendance is limited to 14 people. If the RSVP list is full, join the waiting list—cancellations happen frequently. If the event appears full on the Meetup app, try using a web browser instead. ❌Cancellations & Refunds cancellation prior to 24h before the event, can be refunded. Can’t make it? Update your RSVP to "Not Going" ASAP so someone else can take your spot. 👟 What to Bring For your own safety and comfort, wear sport shoes and clothing (no street shoes—must change into sport shoes) and bring deodorant for ours. 💸 Payment & Contribution (€6.00 per person) Payment must be made in advance via Tikkie. Please only pay once you are added to the going list. In case you do not meet the payment deadline, you may be moved to the not going list. Looking forward to seeing you on the court! 🏐🔥 Let’s play, have fun, and make new friends!

Are you an **expat** in **Utrecht** and do you want to **learn how to swim?** Look no further! Dive into **personalized swimming lessons** with **Your Personal Swim Coach**. Whether you’re a beginner looking to learn the basics or an advanced swimmer seeking to refine your technique, our expert coaches offer **tailored sessions** that fit your needs. **De Kwakel** is a great pool close to the city center, has free parking, and is easy to reach by bus. It's an **amazing learning environment!** **Don't wait any longer:** **[Sign up for a Try Out Lesson!](https://www.your-personal-swim-coach.nl/product/try-out-adult-swimming-lesson/)** Want to learn more first? Go to our **[website](https://www.your-personal-swim-coach.nl/)** or **[schedule a call!](https://calendly.com/ypsc/new-meeting)**

Maki-e is a traditional Japanese lacquer decoration technique. Techiniques are involved drawing pictures, patterns, and letters on the surface of lacquerware using lacquer, and then sprinkling and fixing metal powder, such as gold or silver, onto the surface. In our workshop, you have the opportunity to create maki-e designs using traditional Japanese patterns (wagara) or your own original designs. Then your canvas can be a glass cup or a glass picture frame. Join us for this unique Japanese art workshop in Utrecht. * Place: CLAY TO PLATE Biltstraat 55, 3572 AG, Utrecht * Price: three options you can choose from €56 pp(for a glass cup) €60 pp (for a glass picture frame) €76 pp (for a lacquerwares) Limited seats available. **Booking is essential for adequate preparations. If you've enrolled/registered on the Meetup app, we'll contact you through the app message. Kindly communicate with us accordingly, and refrain from showing up without prior contact. We appreciate your understanding** Website:[https://japanworkshopnet.com/ ](https://japanworkshopnet.com/) [MAKI-E workshop info](https://japanworkshopnet.com/maki-e-workshops/) Email: info@japanworkshopnet.com Mobile:0616059840

'THE SYMPATHIZER' by Viet Thanh Nguyen 'The winner of the 2016 Pulitzer Prize for Fiction, as well as seven other awards, The Sympathizer is the breakthrough novel of the year. With the pace and suspense of a thriller and prose that has been compared to Graham Greene and Saul Bellow, The Sympathizer is a sweeping epic of love and betrayal. The narrator, a communist double agent, is a man of two minds, a half-French, half-Vietnamese army captain who arranges to come to America after the Fall of Saigon, and while building a new life with other Vietnamese refugees in Los Angeles is secretly reporting back to his communist superiors in Vietnam. The Sympathizer is a blistering exploration of identity and America, a gripping espionage novel, and a powerful story of love and friendship.' ***Please read the book and join us for a lively discussion (in English) about the contents during our afternoon book club meeting.*** \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- **PLEASE NOTE:** This is an IN-PERSON event in Amersfoort, The Netherlands. Please cancel your attendance in advance if you are unable to join, so that those on the waitlist can participate. Looking forward to seeing you all IN REAL LIFE then! Best regards, Sandra

**SUSE X I-share:** **Sprekers:** * [Hugo de Vries](https://www.linkedin.com/in/hugo-de-vries/) (Solution Architect) * [Bert Boerland](https://www.linkedin.com/in/bertboerland/) (Account Executive) * [Keown de Koning](https://www.linkedin.com/in/keowndekoning/) (Head of Channel) **Beschrijving** ''Tijdens deze sessie nemen we je mee door het brede SUSE-portfolio. Van de betrouwbare basis van SUSE Linux Enterprise Server (SLES) tot multicluster Kubernetes-beheer met Rancher en zero-trust containerbeveiliging met SUSE Security: SUSE biedt een compleet, onafhankelijk open-source ecosysteem van besturingssysteem tot cloudtechnologieën. We starten met de basis van SUSE en kijken terug naar de ontwikkeling van een Duitse open-source pionier in 1992 tot een wereldwijde enterprise speler van vandaag. Daarbij prikken we door de marketingverhalen heen en delen we praktijkvoorbeelden van organisaties die het volledige SUSE-portfolio inzetten om complexe infrastructuuruitdagingen op te lossen. Ook laten we zien hoe klanten de overstap maken van een Amerikaans georiënteerde infrastructuur naar een Europees alternatief. Tot slot geven we een live Rancher-demo, waarin je ziet hoe alle componenten naadloos samenwerken om moderne IT-landschappen te beveiligen, beheren en schaalbaar te maken. Wat kun je verwachten: * **Het volledige SUSE-verhaal** Hoe een Europese open-source pionier een complete technologiestack heeft opgebouwd – van operating system tot Kubernetes. * **Meer dan alleen containers** Inzicht in het bredere portfolio (Linux & Cloud Native) en waarom dit aansluit bij de behoeften van moderne enterprises. Inclusief mogelijkheden om jezelf hierin te laten opleiden tot specialist. * **Praktijkvoorbeelden uit de markt** Hoe organisaties het volledige ecosysteem gebruiken voor stabiliteit, compliance en schaalbaarheid en waarom SUSE steeds vaker de nieuwe standaard wordt. * **Live demo** Zie het portfolio in actie en ontdek hoe SUSE de volledige keten verbindt: van infrastructuur tot en met de applicatielaag. Of je nu infrastructure architect, platform engineer of security specialist bent: sluit aan en ontdek waarom het SUSE-portfolio perfect aansluit op jouw moderne infrastructuurstack!'' *Het programma zal deze avond als volgt zijn:* * Vanaf 17.15 u: inloop * Rond 17.30/18.00 u: eten * 18.30 u: start sessie * 20.00 u: afsluiting We zien jullie graag dan!

Iedereen is welkom op onze open Freedom Friday Bitcoin Turnhout Meetup @ het super gezellige café Sint Pieter - Grote Markt 60, 2300 Turnhout Geen presentaties. Geen workshops. Gewoon 1 onderwerp: bitcoin. **Connect with Like-Minded Minds** Engage with the Bitcoin community and mingle with fellow enthusiasts. This meetup is your chance to discuss the future, share ideas, and network with pioneers in the decentralized money world. 🏢 **Central Location**: café Sint Pieter ligt perfect centraal, een ruim cafe op de grote markt van Turnhout. Mark your calendars and spread the word!

Samen sporten, gewoon voor de fun, elke week een divers programma, met allerlei verschillende sporten. Je hoeft niet de beste te zijn, maar wel zin hebben om samen te spelen en te leren. Tijdens een training doen we verschillende spelletjes, basketbal, voetbal. volleybal, spikebal, honkbal. Kom je ook, de bal ligt bij jou!! Eerste keer meedoen is altijd gratis, daarna kan je beslissen of dit voor jou is, of niet!! Dus kom een keer proberen. Kan je niet op deze dag, we sporten ook op andere dagen nl Zondag om 9:30 of Maandag om 20:30 Stuur mij een berichtje als je op die dagen een keer wil proberen! The amount of people rsvp'd to this game doesn't match the real number of people at the event, as Meetup is only used for promotion purposes.

The Dutch Heuvelrug is a hilly and sandy ridge, running from Hilversum in the north to Rhenen in the south. This National Park is covered in forest, heather and stretches of sand and dunes. On this hike, we will explore the Heuvelrug from Den Dolder. This area is mostly forested, perfect for a (hot) summer’s day! **Where to meet**: we will meet at **10 am** at train station Den Dolder. We will return to the same train station around 3pm. **This hike is fully booked.** [You may register on my website for a place on the waitlist.](https://rewildyourself.nu/dutch-nature-hikes/)

I'm excited to host the 25st edition of *Strangers to Friends*! Every event so far has been warm, fun and full of great connections. So we’re doing it again! Curious about our previous events? Check out our photo albums (only visible on the laptop version of Meetup). **What to expect** * A safe, relaxed environment to meet both locals and expats, whether you want to meet new people, experience an international atmosphere or talk about business, it’s all possible. * Start the evening with a few rounds of conversation cards: pair up with someone you don’t know, answer meaningful questions and rotate every 10 minutes. Within just one hour, you’ll get to know several people really well and enjoy meaningful conversations. * Everyone comes on their own, so it’s easy to connect. **Practical details** * Doors open at 20:00, after 30 minutes we start with conversation cards * Venue: Boekencafé Libertas, Klarendalseweg 477-1, Arnhem * 20 min walk from Arnhem Central * 7 min walk from Arnhem Velperpoort * You’ll receive 1 drink token for (beer/wine/soft drinks) and snacks all night! * Find us on the right side of the café at the bar, by the window and garden Bring a smile and join us for an evening where friendships grow, business ideas spark and real-life connections happen. Back to basics, away from screens, meeting face-to-face. Warm regards, Julia

Bring your Raspberry Pi, Arduino, microcontroller, or any other electronic project and join fellow electronics makers for a night of creativity and collaboration! This session is open forum to share your current projects—whether complete or in progress, it’s all interesting! Whether you’re deep into embedded systems, exploring new ideas, or just getting started, you’ll find a welcoming space to collaborate, share, and get inspired. **New to electronics or curious about tinkering?** You’re absolutely welcome. If you’re a beginner and want to experiment, I’ll have a couple of starter kits available so you can try things out—whether that’s blinking your first LED, putting something on a display, or experimenting with simple sensors. No pressure and no experience required—just an interest in learning and building. While we continue to pursue a more permanent venue for this Meetup, we’ll be using public library facilities based on availability.

Join Katie McCartney, SRES®, for a straightforward update on the 2026 Central Ohio housing market and its impact on seniors and their families. Whether you plan to buy, sell, right-size, assist a parent, or understand the current market, this session provides reliable insights in a supportive environment. In this complimentary class, Katie will explain trends affecting home buying and selling for older adults in Central Ohio, outline realistic expectations for 2026, and answer your questions in an open Q&A. This supportive, information-focused workshop is designed to provide clarity and confidence with no sales pitch. Ideal for: * Seniors considering selling their current home or purchasing a better‑fit property * Adult children helping parents navigate a home sale or move * Anyone seeking a calm, trustworthy source of information about today's real estate market What You Will Learn: * A senior‑friendly look at the 2026 Central Ohio housing market for buyers and sellers * What to expect when selling a longtime home or purchasing your next one * Personalized answers during an open Q&A You will leave with a clearer understanding of your options and practical steps to move forward with confidence. *** **Hosted by:** **Katie McCartney, Broker & Senior Real Estate Specialist® (SRES) with** Pillar Realty, LLC Compassionate guidance for seniors navigating housing transitions in Central Ohio. *** **Location:** Columbus Metropolitan Library: Dublin Branch 75 N High St, Dublin, OH 43017 ([https://maps.app.goo.gl/GL2vbJgUHqTncbHZ9](https://maps.app.goo.gl/GL2vbJgUHqTncbHZ9)) Meeting Room 2 **Doors Open:** 1 PM **Seats:** Limited Seating (first come, first served) **Cost:** Complimentary

Most people use LLMs by feel: ask a question, read the answer, decide whether it “seems good,” and move on. That works for casual use. It does not work when you are building software, automating workflows, writing important documents, or relying on AI for anything that needs to be repeatable. In this talk, we’ll look at how to improve and evaluate the inputs and outputs of LLMs using practical measurement techniques. We’ll cover how prompt changes affect results, how to compare outputs, how to build simple evaluation sets, and how math-based methods like similarity scoring can help you move beyond guesswork. This will be beginner-friendly, so even if you don't know anything about AI, you should get something out of it. However, this will be a little more technical than our intro talks. You do not need to be an AI researcher, but programmers and technically curious attendees will get a lot out of it. We’ll cover: * Why “it looks good” is not enough * How to improve prompts by changing the input, context, and constraints * How to compare LLM outputs more systematically * Basic evaluation techniques for accuracy, consistency, and usefulness * How embeddings, cosine similarity, and scoring can help evaluate results * Where automated evaluation works — and where humans still need to stay in the loop By the end, you’ll have a practical mental model for treating LLMs less like magic and more like systems you can test, measure, and improve. LOGISTICS AND PARKING: The talk starts at 7:00 PM. The first half hour is reserved for everyone to get set up and mingle. Free pizza and drinks! The cheapest parking option is to find street parking, which will only cost you a few bucks. Otherwise, park in the nearby veteran's museum lot for $8. It's highly recommended you avoid the nearby $15 garage parking.

**Get your creative flow going with a Saturday Afternoon Maker Meetup!** Whether you are looking to carve out dedicated creative time, wanting to get a lingering project across the finish line, or just looking to chat with fellow local makers—this is the space for you. 🧵 **What to Bring** Bring any art or craft project you are currently working on, as long as it is portable and quiet. Think: * **Yarn & Thread:** Knitting, crochet, embroidery, cross-stitch, hand-sewing, mending. * **Paper & Sketching:** Sketchbooks, adult coloring books, watercolors, bullet journaling. * **Digital:** Tablets, iPad drawing, laptop writing/design. * *Please note: Because we are meeting in a shared public space, no power tools, sewing machines, or high-odor materials (like strong solvents or spray glues), please!* **📍 Where to Find Us** * We will be meeting at **Columbus Metropolitan Library - Parsons Avenue Branch** in **Meeting Room 1**. Room is reserved under **CBUS Maker Meetup.** **⏱️ Timeline** * **1:00 PM:** Arrive, grab a seat, get settled, and do a quick round of introductions so we can see what everyone is working on. * **1:15 PM - 3:00 PM:** Open maker time! Chat, craft, relax, and swap creative ideas. **⚠️ A Note on RSVPs** Space for this first meetup is strictly limited to 10 spots. If your plans change and you can no longer attend, please update your RSVP to "Not Going" as soon as possible so someone on the waitlist can grab your spot. We ask that you try to give at least 48 hours' notice if you need to cancel. *** **We can't wait to meet you and see what you're making! All skill levels welcome.**

**Practical Curiosity: Learning from Everyday Data** How do we actually get better at utilizing our day-to-day data? Fancy dashboards and complex models might look nice and draw attention, but that’s not where most of us spend our time. In fact those shiny outputs frequently sit unused, while the real insights are drawn from the analyst’s daily practice. Sometimes it’s as simple and as powerful as noticing that a segment is shrinking, a channel is underused, or certain links keep getting all the clicks. There’s many different places that the spark of insight can come from, but you have to keep your head in the data and know where to look. In this session, we’ll explore real-world examples of how segmentation, testing, and click behavior can uncover practical digital marketing opportunities. You’ll leave with inspiration for your own use cases, along with a few simple ways to ask better questions, spot meaningful patterns, and make smarter decisions without overcomplicating it. **About Our Speaker:** [Elaine Armbruster](https://www.linkedin.com/in/elainearmbruster/) is a Director of Digital Experience at the [American Diabetes Association](https://diabetes.org/), where she focuses on using data and insights to create smarter, more effective digital experiences. A lifelong Columbus resident, she has built her career in email marketing and the broader digital user journey, and is finding she most enjoys working in the messy middle where systems, data, and big ideas don’t quite line up yet. Thanks to our 2026 sponsors: [Clarivoy](https://www.clarivoy.com), [What Box Consulting Group](https://www.whatboxconsultinggroup.com), [Conductrics](https://www.conductrics.com), and [Piwik PRO](https://piwik.pro) More info at [cbusdaw.com](https://cbusdaw.com)

Wild Thursday: THE INVITE on Thursday, July 9th at Cinemark Polaris! Join us as we get together to see the spicy and hilarious comedy-drama-romance from A24, THE INVITE! The film stars Olivia Wilde (who also directs) along with Seth Rogen, Penélope Cruz and Edward Norton, and follows a dinner party that spirals into unexpected places! Here’s a description, trailer and plan for this event: DESCRIPTION: Joe and Angela's marriage is on thin ice. When they invite their enigmatic upstairs neighbors for a dinner party, the night spirals into unexpected places. The film is an English language remake of the Spanish film The People Upstairs by Cesc Gay. It is directed by Olivia Wilde, who also stars alongside Seth Rogen, Penélope Cruz and Edward Norton. BUZZ & ACCLAIM: The Invite premiered to rave reviews at this year’s Sundance Film Festival and sparked an immediate bidding war to acquire it! The film is earning a 93% positive rating with critics calling it, “marvelously entertaining” and “endlessly relatable, sometimes uncomfortably so!” Others call it, “a smart, sophisticated and incisively acted” comedy “with plenty to say and even more laughs to share.” TRAILER: [https://www.youtube.com/watch?v=OJ19I9q_hOQ](https://www.youtube.com/watch?v=OJ19I9q_hOQ) PLAN: Details for this event have already been confirmed! Please purchase your ticket for the 6:45pm showing and we’ll meet in the lobby area between 6:20 and 6:30pm! Advance ticket purchase is advised! Once you have yours, please list your seat number in the Comments below. Look forward to seeing you there, Dan

NFT's are here to stay folks! This is a group for like minded people interested in understanding, leveraging, using, creating for, profiting from, trading too i suppose, NFT's.. everything around them, complexity, fear and exploits, best practices and more. **PLUS** This group will talk AI ART tools, techniques, artists, video, audio, prototypes and more in the AI assisted production space- ART specifically, but we can get into any aspect of some of the cooler things happening in AI in general.