.NET

Dear JUG members, We’re happy to share that ApeldoornJUG will once again serve as an official Community Ambassador for **J-Spring 2026 – The Future of Modern Java**. 📍 J-Spring Conference 2026 🗓 June 4, 2026 📌 Kinepolis Utrecht **This year’s conference will cover:** • Data, AI, GenAI & prompt engineering • Platform engineering & architecture • Security • People & Culture • New & exciting topics Featuring speakers such as **Holly Cummins, Josh Long, Marit van Dijk, Nicolai Parlog, and many more.** Expect inspiring keynotes, hands-on workshops, and labs. Also returning this year: **The Mentorship Hub powered by Bruno Souza**. **The talk schedule is now live:** 👉 [www.jspring.nl](https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.jspring.nl%2F&data=05%7C02%7Ca_de_ruiter%40belastingdienst.nl%7C757f3b88ba6a4ee59d8e08dea6c04f2b%7Cc8fba4776d4d4f00941a6e6150c721f3%7C0%7C0%7C639131542095649438%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=cPr6C5RZu19Vm4tM%2FXDakYUCx5qf1sztXzyHIqvUGgY%3D&reserved=0) Looking forward to seeing you there!

¡Compartamos juntos con el grupo de personas más divertido de la ciudad!... ¡en español! No necesitas ser un hablante fluido o nativo.... ¡Solo atrévete a compartir! Te esperamos a las 20hrs.... ¡Entrada gratuita! ¡Nos vemos! ¡Hasta entonces! 😃 Let's share together with the funniest group of people in town!... in Spanish! You don't need to be a fluent or native speaker.... Just dare to share! We wait for you at 20hrs ....Free entry! Nos vemos! Tot dan! 😃 Facebook Group: https://www.facebook.com/groups/habladores/ Meetup Link: https://www.meetup.com/nl-NL/los-habladores/ Instagram page: https://www.instagram.com/los_habladores_utrecht/ Los Habladores!

**Speeddaten Utrecht** Al twaalf jaar organiseren we speeddates in Utrecht. Ontmoet je graag een groot aantal singles in korte tijd, dan is speeddaten iets voor jou! Tijdens een speeddate heb je ongeveer 15-20 dates van 4 minuten. Wanneer de bel klinkt, schuift de helft van de singles door naar de volgende tafel. Op je datekaart geef je aan met wie je verder in contact wilt komen. **Locatie** Het speeddaten vindt plaats bij [Anne&Max Domstraat](https://www.annemax.nl/vestigingen/utrechtdomstraat/), een sfeervol en ruim opgezet restaurant. We hebben een apart gedeelte van het restaurant gereserveerd, zodat je alle privacy hebt tijdens het daten. **Matchmail!** Binnen een dag na de speeddate ontvang je van ons een e-mail met de voornaam en het e-mailadres van de singles met wie je een match hebt. Heb je bij alle deelnemers ‘nee’ ingevuld? Dan is je volgende speeddate [gratis](https://aboutlove.nl/geen-klik-volgende-speeddate-gratis/)! **Kom je ook speeddaten bij About Love?** Heb je zin in een avond vol ontmoetingen in Utrecht? Schrijf je dan nu in voor deze speeddate! Bij About Love ben je in goede handen; wij zijn een ervaren speeddate-organisatie met uitstekende [recensies](https://aboutlove.nl/is-speeddaten-leuk/) en bieden speeddates aan voor de laagste prijs. Date je mee? >> [https://aboutlove.nl/event/details/speeddaten-utrecht-33-47-jaar/](https://aboutlove.nl/event/details/speeddaten-utrecht-33-47-jaar/)

Join us for an hour of writing! We’ve discovered that it’s strikingly helpful to write with other writers. See if it’s true for you at Factor-ij Amsterdam on Thursday mornings. Be it a book, blog, script, essay, dissertation, resume, melody, poem or just plain work stuff, you are invited to write it with us. No one will see what you've written or give you unsolicited advice. Instead of just thinking about writing, come and get some real writing done. SCHEDULE: 11: 15 AM - Quick introductions 11: 30 AM - Timer starts: write for 1 hour 12: 30 PM - The End: chat, take off, or keep writing OPTIONAL SOCIALIZING happens at 12:30 pm after the writing is wrapped. Writing is very solitary. Connecting (and sometimes even commiserating) with other writers is a cool thing. BEING LATE IS OKAY: just show up and get settled, then check-in with me after the session. (I’ll be the person with the Shut Up & Write! sign.) If you were on time, please be willing to make room for the friendly latecomer. Happy writing and I look forward to seeing you at Factor-ij! What Should I Bring? Whatever you need to be able to write! Bring earbuds/earplugs if you want to block the cafe’s overhead music or the occasional conversation by other patrons. Please come with your devices pre-charged, since we probably won't be always sitting somewhere with charging possibilities. Other Important Details: Travel by public transportation: 1. Take Tram 26 from the central station Amsterdam, and step out by the last stop. 2. Take bus 66 from the Amsterdam Bijlmer station, step out by Pieter Oosterhuisstraat, and further walk in the direction of the bus till the corner. FREE Wifi. Compulsory consumption is not required, but please do order a drink to honor our generous host.

Are you an **expat** in **Diemen** 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. The **AGO** pool in Diemen is a small private pool originally utilized for **aqua therapy**. Therefore the water is nicely **warm** which gives ideal teaching conditions. **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)**

Cada primer jueves del mes: café español (! atención ! : nos mudamos a Mariapaviljoen, en frente al shopping Arena) en el centro de Den Bosch, ¡bienvenid@s a tod@s! \*\*\* Para todos los amantes del español: cada primer jueves del mes nos juntamos para hablar el idioma de Frida Kahlo, Mercedes Sosa y Penélope Cruz ;). Un encuentro informal para conocer a otros hispanohablantes y compartir risas, experiencias y buenas vibras. ¡Bienvenid@s! (entrada libre y gratuita) Voor alle liefhebbers van de Spaanse taal: elke eerste donderdag van de maand komen we samen om de taal van Frida Kahlo, Mercedes Sosa en Penélope Cruz te spreken ;) Een informele bijeenkomst om andere Spaanstaligen te leren kennen, samen te lachen en ervaringen uit te wisselen. Wees welkom! (gratis entree) (Organizadora: evelyne montens > si tienes alguna pregunta, no dudes en contactarme por messenger)

We are thrilled to welcome you to our 10th edition of the AI Native Netherlands, hosted at the [Yuma](https://www.weareyuma.com/en) headquarters in Amsterdam. This edition is capped at 120 attendees. Yuma's office has limited space, so once the 120 seats are filled, registration closes and additional signups move onto the waitlist. A massive thank you to our host, Yuma, for their generosity in providing the venue, food, and drinks for this evening and for supporting the Dutch AI engineering community. **We'll cover:** * What humans still bring to software building when AI is writing the code * Tackling technical and social complexity inside distributed, fast-moving systems with legacy at the core * How to evaluate AI agents in production and catch silent regressions in under an hour * What "AI Native infrastructure" looks like in the wild: prompt changes, harness updates, RAG documentation, model swaps **Speaker 1: [Nico Krijnen](https://www.linkedin.com/in/nicokrijnen/) ([Yuma](https://www.linkedin.com/company/weareyuma/))** An explorer at heart, Nico loves to navigate the ever changing technology landscape and find practical solutions to complex problems. For a big chunk of his career, he disrupted the DAM space by building an innovative file management solution called Elvis, which is being used by media organizations all over the world. Besides leading and supporting teams and giving direction, he likes to roll up his sleeves and experience first-hand how (and whether) the latest technologies work in the real world. He is never shy of making unconventional choices to achieve radical results. **Talk: The human side of coding** Now that AI's are writing our code, what is the value that we humans still bring to building software systems? Our tech stacks are exploding in complexity, systems are more and more distributed and fast-paced development leads to an ecosystem full of fragile legacy systems that provide the backbone of business capabilities. How do we tackle that technical and social complexity? Do we take the usual route and solve it by adding more tech or AI? Or is there another way? Even in the 80's, people realized that the theory of a system can't be transferred through code and documentation alone. It requires developers to work closely together. We need to encourage human collaboration across disciplines, backgrounds and personalities (including our new AI buddies). Learn how you can use your human power skills to better understand the problems you're facing and build systems that last! **Speaker 2: [Floris Weers](https://www.linkedin.com/in/floris-weers-61392b160/) ([Biscuit](https://www.linkedin.com/company/biscuit-so/))** Floris is an ML engineer based in Amsterdam. He was responsible for continued-pretraining (or mid-training) at Apple's Foundation Model team, contributing directly to Apple Intelligence. Before that, he finished his master's degree at the University of Twente while building games on the side. He is a named author on the Apple Intelligence Foundation Language Models tech report, which describes the \~3 billion parameter on-device model and the large server-based model powering Apple Intelligence features. His research work at Apple also spanned multimodal models, mobile vision transformers, and distillation scaling laws. **Talk: The silent failures of AI: how to evaluate?** AI doesn't crash when it fails. It quietly does half the job. We'll go over a systematic way to evaluate agents in real product settings, allowing us to catch regressions and decide within an hour whether to use a newly released model or stick with the previous setup. A side-effect of the evaluation framework is that no engineer is scared of touching system prompts, making deeper harness changes or adding documentation to the RAG systems. **Agenda:** 18:00 — Arrival, food & drinks 18:30 — Talk \#1 \| Nico Krijnen 19:15 — Talk \#2 \| Floris Weers 20:00 — Networking & more drinks 21:00 — Wrapping up **What to bring:** Just curiosity and questions. If you've been working through agent evaluation, RAG system updates, or human-AI collaboration in your engineering team. **Who is this for:** Platform engineers, AI/ML engineers, SREs, architects, and engineering leaders focused on building and validating reliable AI systems in production. **Where to find us:** Yuma (4th floor), Business Centre Pedro de Medina, Pedro de Medinalaan 1, Amsterdam. 15 minutes from Amsterdam Central using tram 26. Paid parking at Parkbee Sluishuis across the street. [Maps link](https://maps.app.goo.gl/bd353dgCFd4TkDEq8)

'HOMEGOING' by Yaa Gyasi 'Two sisters with two very different destinies. One sold into slavery; one a slave trader's wife. The consequences of their fate reverberate through the generations that follow. Taking us from the Gold Coast of Africa to the cotton-picking plantations of Mississippi; from the missionary schools of Ghana to the dive bars of Harlem, spanning three continents and seven generations, Yaa Gyasi has written a miraculous novel - the intimate, gripping story of a brilliantly vivid cast of characters and through their lives the very story of America itself. Epic in its canvas and intimate in its portraits, Homegoing is a searing and profound debut from a masterly new writer.' ***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

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!

* We **start at 11:10** in front of Hotel Restaurant de Loenermark: Eerbeekseweg 4, Loenen https://maps.app.goo.gl/4W6e27ij3aqjQnFg6 * Length: \~16 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 bus:** * Bus stop: Loenen, Bruisbeek https://maps.app.goo.gl/863vGKfe8nqBvZfw7 **Getting there by Car:** * Free parking opposite of Groenendaalseweg 15, Loenen https://maps.app.goo.gl/W6213M7LwEQv8PMg6 or Free parking in the streets, close to: Eerbeekseweg 4, Loenen https://maps.app.goo.gl/awWbkpVZJVzxmX859 **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=eSkpxZf7TymaoFsvJkBCKQ * 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.

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

**Modern and Authentic kintsugi workshop in Utrecht.** Choose from three options: * 1-Day Modern Kintsugi workshop-€60 * 2-Day Modern Kintsugi workshop-€96 * 4-Day Authentic Kintsugi workshop -€180 For all details, please visit my website. [https://japanworkshopnet.com/upcoming-workshops/](https://japanworkshopnet.com/upcoming-workshops/) Location: **CLAY TO PLATE** [Biltstraat 55, 3572 AG, Utrecht](https://www.claytoplate.com/) **Booking is essential**. Please contact me if you would like to participate in the workshop. Email: info@japanworkshopnet.com Mobile:0616059840

**We have limited space at the café, so if you've RSVPd and can't make it, please cancel as early as possible so another person can join!** Join in for a morning of crafting & chatting over a drink. Just bring your own project and payment for drinks. Meet fellow crafting enthusiasts, whether it's knitting, crocheting, stitching, origami, or something more unique! We talk about our projects, exchange tipps, but also just get to know each other and enjoy a relaxed Sunday morning in good company. We now also have a WhatsApp group, where we organise get-togethers and other events. Ask one of the organisers at the next Meetup you join for more information and access.

**Important time note:** Please plan on arriving between 5:30 and 6:00 as the elevators lock after 6 and you'll need to message us and we'll need to come get you. The building address is 4450 Bridge Park The entrance is 6620 Mooney St, Suite 400 You will need to scan your ID at the door to get a visitor badge. **Abstract** *Customize the IDE: Building Extensions for Visual Studio Code* Visual Studio Code is one of the most widely used development environments today, and much of its flexibility comes from its extension ecosystem. Extensions allow developers to customize the editor with new features, integrations, and workflow improvements tailored to their needs. In this session, we’ll cover what extensions are and the different types available, including full extensions written in TypeScript or JavaScript, along with lighter-weight extensions such as color themes, language packs, language support, code snippets, and keymaps. We’ll also look at practical reasons a developer might create an extension, from automating repetitive tasks to adding custom tooling. The session includes a hands-on walkthrough of creating a new extension, testing it locally, and understanding the basic project structure. We’ll close with a brief overview of how extensions are packaged and published to the Visual Studio Marketplace and other distribution options. **YouTube Link** TBD

**Important time note:** Please plan on arriving between 5:30 and 6:00 as the elevators lock after 6 and you'll need to message us and we'll need to come get you. The building address is 4450 Bridge Park The entrance is 6620 Mooney St, Suite 400 You will need to scan your ID at the door to get a visitor badge. **Abstract** *July Meeting - Lightning Talks!* Lightning talks are very short presentations on a topic of your choice (must be related to .NET). Talks should be 15-20 minutes in length and include minimal slides and quick demo (no live coding please). There will be 6 slots available! First come, first serve! **YouTube Link** TBD

We have moved to guild.host. Look us up there. https://guild.host/events/buckeye-cocoaheads-rcavwd

On Thursday, June 18, 2026, we will meet in the 700N Conference Room at 700 N Hurstbourne Pkwy for a special Louisville .NET Meetup as we host **Microsoft Build //localhost:louisville**. Doors open at 6:00 p.m., and the presentation will begin promptly at 6:30 p.m. TEKsystems will provide food, so please RSVP to help us plan appropriately. The session will also be streamed at **[https://twitch.tv/TaleLearnCode](https://twitch.tv/TaleLearnCode)**. This month, we’ll dive into the most important announcements from **Microsoft Build 2026**. Chad Green will present a curated, developer‑focused walkthrough of the new capabilities across .NET, Azure, AI, developer tooling, and platform updates. We’ll explore what these announcements mean for architects and developers, how they fit into real‑world solutions, and which changes you can start applying immediately in your projects. **Important:** To participate fully, please RSVP in **both** places: * **Louisville .NET Meetup** (this page) * **Microsoft Build //localhost:louisville registration**: [https://developer.microsoft.com/en-us/reactor/events/27112/](https://developer.microsoft.com/en-us/reactor/events/27112/) After the session, we’ll head to Brick House Tavern to continue the conversation over food and drinks.

We are bringing Microsoft Build sessions to Columbus Ohio! The Central Ohio Azure Meetup and Central Ohio .NET Developer's Group (CONDG) are coming together to bring some of the labs and breakouts from Microsoft Build to your backyard. In this free, 1 day event, you are going to Build stuff with us! And yes, there will be free food. So please RSVP for a head count!

Topic to be announced. **THANK YOU** *Franklin University* for hosting our meetup! To learn more about *Franklin University*, please visit their website: https://www.franklin.edu/ **DIRECTIONS** Franklin University Fisher Hall 300 E. Main St, Columbus, OH 43215 Map: https://maps.app.goo.gl/jxjBA2hUmS5qrvhq8 Parking is FREE! Please park in Lot C in front of Fisher Hall. See attached map. NOTE: Map the address only. When mapping with Google Maps it may use the Fisher Hall at OSU, which is NOT correct. **Want to sponsor the pizza and/or bar tab?** Please contact me if you would like to sponsor this meetup's pizza and/or bar tab: angelo@mandato.com