Critical Thinking

Hi✋ At[ Data Tribes ](https://www.datatribes.nl/)we organise Meetups because we truly care about sharing knowledge both inside and outside the organisation. We believe that it is beneficial to us and to the market as a whole to connect, create, learn and grow together! **The agenda** // Doors open 6.00pm // Drinks and Pizza’s 6.30pm // Start presentations 7.00pm **Henk van der Valk:** "Optimizing the Azure cloud?" ***Who really cares about Cost & Co2?*** // Start networking 9.00pm // End Meetup 9.30pm Greetings, Data Tribes Inc.

**ArnhemJUG** We are excited to announce the second meetup of 2026. OpenValue Arnhem is once again hosting us for the February meetup! **Agenda** * 17:00 CET walk-in * 17:30 – 18:30 Food and drinks * 18:30 – 19:30 talk: **Catching the 137-Killer: A Java Memory Forensics Investigation** by **Martijn Dashorst** * 19:30 – 19:45 break * 19:45 – 20:45 talk: **Building AI Agent Platforms: Architecture, Communication, and Standards** by **Pascal Wilbrink** * 20:45 – 21:30 drinks **Catching the 137-Killer: A Java Memory Forensics Investigation** Your Java application is running smoothly, blissfully unaware of the danger lurking just around the corner. Then—without warning—it vanishes without a trace. Upon investigation, you discover the virtual remains of countless slain JVMs, each marked with the same cryptic number: 137. A serial killer is on the loose in your cluster. This true crime investigation will walk you through the differences between JVM memory areas, the mechanics of container OOMKills, analysing Grafana dashboards for memory and thread anomalies, interpreting heap dumps, and utilising JVM Native Memory Tracking (NMT) to uncover hidden native memory consumption. You’ll master practical forensic techniques and proven prevention strategies—from memory tuning tactics and balancing heap vs. non-heap allocations to leveraging large language models (LLMs) for advanced forensic analysis. These skills will help ensure your applications stay alive—even when something’s out to get them. Just like in a real murder mystery, we may not know whodunnit... but with Martijn Dashorst leading the investigation, you're sure to get closer to the truth. **About Martijn Dashorst** My Java experience is finally old enough to drive, vote and drink a beer (not all at once). One of the remaining Eclipse users, loves Java, relationship with Maven is complicated. Martijn Dashorst has worked since 2004 at Topicus and has used Java since 2002. Loves server-side Java. You might know him from Apache Wicket—he's dabbled somewhat in that framework. Loves his family and cats, finds Douglas Adams' description of the Sirius Cybernetics Corporation's technology very apt to the current technology landscape. **Building AI Agent Platforms: Architecture, Communication, and Standards** AI systems evolve from standalone models into connected, agent-based ecosystems, new architectural patterns, protocols, and standards are emerging. Concepts such as AGUI, A2A, A2UI, and MCP-based applications are changing how intelligent systems are designed and integrated. This presentation explains how these approaches affect system structure, responsibilities, and interoperability. Using architectural diagrams, it shows how AI agent applications communicate and collaborate through standardized interfaces, and provides guidance on building scalable and maintainable AI platforms. **About Pascal Wilbrink** Pascal is a senior software engineer at OpenValue with over a decade of experience and a strong interest in applied AI and intelligent automation. He enjoys exploring how technology can make developers’ lives easier and software more resilient. When he’s not experimenting with new ideas or building open-source tools, Pascal likes to learn by doing and turning complex problems into practical solutions.

Donderdag **26 februari 2026** is het weer tijd voor onze **Techday**: hét vaste moment waarop we kennis delen, elkaar inspireren en nieuwe ideeën direct in de praktijk brengen. Deze editie komt een spreker van Onyx langs. Onyx is gespecialiseerd in cybersecurity. Tijdens deze techday worden theorie, praktijk en nabespreking gecombineerd met directe toepasbaarheid in jullie dagelijkse werkzaamheden. Tijdens de Techday duiken we hands-on in veelvoorkomende kwetsbaarheden en misconfiguraties binnen moderne softwareontwikkeling. Theorie, demo’s en realistische scenario’s wisselen elkaar af. Met de interactieve CTF‑opdrachten leer je niet alleen hoe deze problemen ontstaan en misbruikt worden, maar vooral hoe je ze direct kunt toepassen en voorkomen in je dagelijkse werk. **Wanneer:** Donderdag 26 februari 2026 **Wat:** Cybersecurity in de Praktijk: Hands-on met Onyx **Voor wie:** Iedereen die nieuwsgierig is en wil leren **Agenda** 14:45 - 15:00 - Inloop 15:00 - 18:00 - Opening en introductie Praktijkvoorbeelden: Wat zijn wij in het echt tegengekomen Security misconfiguration: Gezamelijke spot-de-fout met code-snippets CTF opdrachten 18:00 - 19:00 - Eten en napraten We zien je graag op de Techday!

Een avond in een ontspannen sfeer voor alle leeftijden. Geniet van een drankje van ons en ontmoet nieuwe mensen. Je kunt alleen komen of samen met een vriend(in). Tijdens de avond maak je makkelijk contact met anderen die ook op zoek zijn naar betekenis. Meld je aan en kom bloeien! Tijdens deze bloeiklas maken we tijd vrij voor een gezonde dosis zelfreflectie. Er is zoveel mogelijk! Fijn natuurlijk, maar soms ook best ingewikkeld. Want hoe maak je dan goede keuzes? En hoe ga je om met alle verwachtingen van de maatschappij, je omgeving en natuurlijk van jezelf? Belangrijke vragen in een tijd van burn-outs, keuzestress en prestatiedruk. Met meditatie, visualisatie en creatieve werkvormen gaan we dieper in op onze verlangens, drijfveren en (on)bewuste overtuigingen. Tegelijkertijd halen we de druk van de ketel, want willen we niet te veel? We zijn constant in ontwikkeling, verkennen vele opties en proberen de beste keuzes te maken. Wat heb jij nodig om te bloeien? Met de inzichten van de Duitse filosoof Byung-Chul Han gaan we op zoek naar de vrijheid in onze prestatiesamenleving en met David Brooks’ bestseller ‘De Tweede Berg’ duiken we in de vraag aan welke roep je gehoor moet geven, als er van alles om ons heen roept. Meer weten of hiervoor aanmelden? Bezoek de onderstaande link: https://www.dekwekerij.org/bloeiklas/utrecht-ontdekken/

¡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!

Wil je op een laagdrempelige manier van gedachten wisselen over hoe we de toekomst van Flevoland en Europa kunnen vormgeven? Of wil je in gesprek over nieuwe, progressieve ideeën? Kom dan naar ons maandelijkse Politiek Café LIVE en praat mee over de toekomst! #### **Wat is Politiek Café Live?** Politiek Café Live is een open en informele ontmoetingsplek voor iedereen die geïnteresseerd is in de politiek van Volt. Of je nu lid bent of gewoon nieuwsgierig, je bent van harte welkom. Elke maand gaan we in een ontspannen sfeer met elkaar in gesprek over actuele thema's die spelen in onze provincie en daarbuiten. #### **Wanneer?** Politiek Café Live vindt elke maand plaats. Zie voor overige data en events: https://voltnederland.org/flevoland/agenda #### **Voor wie?** Voor iedereen! We zijn een open beweging en geloven dat de beste ideeën ontstaan als we samenwerken en verschillende perspectieven overwegen. Neem gerust een vriend, buurvrouw of familielid mee.

Andrew Fray is back to present his talk on "Productive and Pragmatic Prototype Programming". The Game Dev Group is a chilled, friendly place for anyone interested in game development to meet, learn and collaborate together. **The Speaker for this event is Andrew Fray.** Andrew is an automated testing consultant, speaker and developer with a background in programming for studios like SEGA, Codemasters, SpryFox and Roll7. He will be sharing high-level insights into programming with prototyping in mind and how it differs from programming for production. Structure: 6:30PM - Doors Open - Bar Snacks, Drinks, Networking/ Chatting 7:00PM - Introduction and Talk Begins 8:30PM - Talk Finishes, More Chatting, More Snacks, More Drinks 9:30PM - Last Orders Please let your game dev friends and colleagues know about this group too. We hope to build it into a great resource for the community over the coming months and years. 1 Mill Street is the incredible home of TheGDG, a place designed to blur the lines between work and play. For more information about the co-working facilities, podcast studio or event space, check out their website. Maverick Games is a UK-based independent video game studio, focused on creating premium open-world AAA titles for consoles and PC. The studio champions a developer-first culture that encourages creativity, bold ideas, and risk-taking to craft innovative gaming experiences. Playground Games are an award-winning studio based in the heart of Leamington Spa. They have built one of the biggest franchises on Xbox with Forza Horizon, and are currently building one of the most highly anticipated games of the decade: Fable. They are recruiting across both teams, so check their website to see if there is a role for you! Code Wizards Group – Code Wizards and Multiplayer Wizards – help studios build and run games that players love. Their company specialises in video game consulting services for backend elements, powering up gaming projects with expert gametech, esports-tech, and LiveOps services for game dev professionals and studios. Rebellion is an independent video games studio that also produces books, comics, TV, Film, board games, etc. They make great games such as the genre-defining Sniper Elite series and Zombie Army, and before 2010 have worked on multiple amazing external projects including the likes of Aliens vs Predator and Star Wars Battlefront. Creare Capital is a financial platform dedicated to empowering small and medium-sized enterprises (SMEs) and freelancers in the creative industries by connecting them with tailored grants, loans, and investment opportunities. Their mission is to bridge the gap between finance and creativity, offering inclusive, flexible funding solutions that help creative businesses grow and thrive. Sorcery.gg is a jobs platform built by game devs, for game devs. The platform is one of the biggest in the industry, with over 15,000 roles listed. Sign up for an account and start your hunt. Black Cat Entertainment is an indie studio focused on supporting junior game devs get their chance in the industry. In order to show appropriate respect to the organisers, speakers, and your fellow community members, please ensure you attend if you RSVP! See you there! A disclaimer: This event is intended for an audience of people aged 18+ and alcohol will be present. Anyone under the age of 18 must be accompanied by a responsible adult.

Join us for some focused writing time. All writers and all experience levels are welcome and don’t worry, no one will see what you've written. This session is about getting your writing done and meeting other writers in your area. When you show up, say hello to everyone, grab a drink, and get your writing tools ready. Once you’re all settled, take some time to chat with your fellow writers. Once everyone’s arrived, I will lead quick introductions and then set the timer for our quiet and focused writing session. Afterward, we’ll have time to chat and get to know each other. We often talk about our successes and challenges as writers. If you don’t have time to stick around, no worries! **A note about the format** We don’t host critiques or readings. These events are a safe space for writers of all skill levels and genres to work on their craft, so no one will read or critique your writing. For our full event schedule, visit [https://shutupwrite.com](https://www.shutupwrite.com). **Other Important Details:** WiFi name/password: [PLEASE INCLUDE DETAILS] Travel / Parking info: [PLEASE INCLUDE DETAILS]

**(Tickets + event access exclusively available through EventBrite.)** Full event link here [From Fixed to Flow - EventBrite](https://www.eventbrite.nl/e/from-fixed-to-flow-an-online-workshop-of-creativity-and-release-tickets-1981557382473?aff=oddtdtcreator) Loosen the mental knots you didn’t know you were tightening. Use creativity to move from fixed patterns into more open habits. Refresh yourself before a new week with an easy, online workshop to open your mental well-being through creative mindset from a stuck sense of routine to more flexible state. \*\* What You'll Experience:\*\* * **Structured, guided conversations** where thinking out loud is part of the method. It's not a lecture, and it is a blend of psychology, art, and practical ritual. * A **live, interactive exercise** to break rigid thinking and experience "flow." * A **supportive space to connect** with others feeling the same desire for more lightness and less rigidity. **️ What You'll Take Away:** * **The "Separation of Tasks" Tool:** A philosopher's secret to deflating anxiety about others' opinions. * **The Conduit Mindset:** How to replace "Is this good?" with the liberating question, **"What happens if you stop deciding in advance what ‘good’ looks like?"** * **Your First Micro-Ritual:** A simple, 5-minute daily practice to make creativity an inevitable source of calm. * **Clarity & Permission:** A clear map to identify your "Fixed Self" and the courage to gently unfurl from it. **✨ This is for You if:** * You feel mentally "stuck" or confined by your routines. * You've ever said, "I'm not a creative person." * You long for more playfulness, less pressure in your daily life. * You desire to use creativity as a tool for well-being, not just output. * You are 18+ years of age. \*\* Workshop Details:\*\* * **Duration:** 90 minutes * **Format:** Live, interactive virtual session (Link provided upon registration) * **Investment:** €7 less 15% off through 1 March * **What You Need:** A quiet/comfortable space, a willingness to be gently curious, and one ordinary object within arm's reach (a pen, a cup, a book). **(Tickets + event access exclusively available through EventBrite.)** Full event link here [From Fixed to Flow - EventBrite](https://www.eventbrite.nl/e/from-fixed-to-flow-an-online-workshop-of-creativity-and-release-tickets-1981557382473?aff=oddtdtcreator)

“Where big ideas meet open minds — join us!” “Speak your mind, challenge perspectives, make friends.” “From ancient philosophy to AI — your thoughts matter!” “Curious minds unite for a freestyle philosophy jam!" “A safe space to think out loud and explore deeply.” “Old wisdom meets new ideas — let’s jam!” “Question everything. Discuss anything. Connect with everyone.” “Bringing thinkers together to inspire and grow.” “Your ideas, your voice — let’s jam freely!” “Dive deep, laugh loud, and think bigger together.” Welcome to **Generation Thinkers — Philosophy Jam: Speak Your Mind!** This is more than just an event — it’s a movement. A place where old wisdom meets future visions, where deep questions lead to unexpected friendships, and where every voice truly matters. Bring your curiosity, your stories, and your boldest thoughts. Let’s explore everything from timeless philosophical debates to modern challenges in AI, love, freedom, and beyond — all in a relaxed, freestyle atmosphere. 👥 **Who’s it for?** Anyone craving meaningful conversations and genuine human connection. No preparation, no pressure — just your open mind and willingness to share. 🌟 **Why join?** * Make real connections beyond small talk * Get inspired and inspire others * Grow your perspectives and confidence * Be part of a friendly, international community 🔥 **Join us to think, laugh, challenge, and grow — together. Reserve your spot and let’s make this an unforgettable night!** **Event Joining Rules:** • Aim to arrive on time (ideally 5–10 minutes early). • If you’re running late, please notify me as the host. • Newcomers will be given some flexibility in their first sessions.

**🟢🟢 ABOUT OUR WATERCOLOR PAINTING PARTY / AMERSFOORT** 🎨🥳🍷🏢 Amersfoort - Utrecht Province / Center of the City / Easy access from train station. Create your very own **portrait, animals, landscape, or figurative** masterpiece in only **2.5 HOURS using watercolor and our secret mixed media techniques!🧪🧫.** This session is not about perfection; it is about capturing emotions and personal expression. **No experience required** **\- trust us\!** our professional artist will guide you step-by-step through this unique self-portrait journey. You can look forward to a fun and exciting evening with other participants, **so it doesn't matter if you want to come with friends or alone - you are very welcome!** This is the perfect after-work or weekend activity where you'll unleash your creativity while creating something deeply personal. You will create a portrait combining painting, drawing, and creative techniques to bring your unique vision to life. When finished, you'll take home your newly created self-portrait artwork to cherish or share with loved ones. Each participant will have pencils, colored pencils, watercolor, acrylic/gouache paints, and a surface. You'll work from an image we will bring. **🎟️ READY TO HAVE FUN?** Get your Ticket and book your seat **✨[HERE](https://buymeacoffee.com/artloversclub/e/430555) ✨** 🤔 **Questions?** Speak with a member of the team in **[WHATSAPP HERE](https://chat.whatsapp.com/J3Y5yeWUhvbJM98bqty2WP) 💬** .................................... **🟢🟢 WHAT'S INCLUDED?** 🔶 All supplies included 🔶 **2.5-HOUR [TICKET SESSION](https://buymeacoffee.com/artloversclub/e/430555)** 🎟️ 🎁 **EXTRA BONUS:** **FREE TICKET**🎟️ to participate in our Drawing and Painting Cafes in Amersfoort or Our Online Still-Life sessions if you live far away. 🔶 New friendships and Conversations💬 🔶 Freedom to work at your own pace 🔶 **English tutored activity** (And of course, you can speak in your local language with your friends!🍷🥰🥰🍹) ⭐ No experience needed **🎟️ BOOK YOUR SEAT🪑 IN ADVANCE ✨[HERE](https://buymeacoffee.com/artloversclub/e/430555) ✨!** 🤔 **Questions?** Speak with a member of the team in **[WHATSAPP](https://chat.whatsapp.com/J3Y5yeWUhvbJM98bqty2WP) 💬** **🕑 2026 CALENDAR OF UPCOMING EVENTS:** First Sunday or every month from 11.00 AM - 1:30 PM. .................................... **🎟️ ART LOVERS CLUB / ABOUT US** **ART LOVERS CLUB** is a community where art enthusiasts come together to explore their creativity and connect with new buddies through various events and sessions ( In-Person and Online) . Whether you're a seasoned artist or just starting, we have something for everyone!⭐ To share with you more about what we do, you can see here the overall atmosphere of our events in Amersfoort and also follow us if you want⭐: **[https://www.instagram.com/art_lovers_social_club](https://www.instagram.com/art_lovers_social_club)** 🤔 **Questions?** Speak with a member of the team in **[WHATSAPP](https://chat.whatsapp.com/J3Y5yeWUhvbJM98bqty2WP) 💬** **🕑 2025 CALENDAR OF UPCOMING EVENTS:** First Sunday or every month from 11.00 AM - 1:30 PM. **See you soon. We are looking forward to painting and having Fun Together! 🎨👩🏼‍🎨👨🏼‍🎨👩🏼‍🎨🧑🏼‍🎨🎈**

JULIANALAAN 100 park Angerenstein ( Entrance )

Join Creative Table for an interactive and fun Create & Connect session in Apeldoorn aimed at fostering community building. Unleash your creativity in a supportive and inclusive environment, where members can connect, share ideas, and collaborate on various art projects. Whether you are a seasoned artist or just looking to dabble in something new, this event welcomes all skill levels. Come prepared to mingle, create, and be inspired by the diverse talents within our community. Let's paint, draw, and sculpt our way to stronger connections and lasting friendships.

This meeting will be an open discussion about the book "an Immense World" by Ed Yong

The Humanist Monthly Program is our longest running event and still a community favorite. In the old days it used to be called "Going to HCCO" and we still like to think of it as our flagship event. Food and drinks will be provided at the event. Feel free to show up a little bit early to hang out and talk. Our March speakers are Molly Gaines and Zack Parrish, co-organizers of the Secular Education Association: They will share their story of how a small group of Ohio parents grew into a national organization tracking released-time religious instruction and other church–state issues in public schools. The presentation will cover SEA’s early wins and hard lessons, what we’re seeing nationally right now, and how local advocates can play a meaningful role in protecting public education. Attendees will leave with a clearer understanding of the landscape — and practical ways to get involved. Going forward our meetings will be hybrid. You can meet us in-person or attend online Join Zoom Meeting [https://us02web.zoom.us/j/87836564953?pwd=4Mi57ElZkDIFlb1fnlNwOJ0NiOK4tP.1](https://us02web.zoom.us/j/87836564953?pwd=4Mi57ElZkDIFlb1fnlNwOJ0NiOK4tP.1) Meeting ID: 878 3656 4953 Passcode: 760812 One tap mobile +19292056099,,87836564953#,,,,\*760812# US (New York) +13017158592,,87836564953#,,,,\*760812# US (Washington DC) The formal presentation will start at noon

We'll meet at The Capital One Café, 167 Easton Town Center, Space A-103. This is in the main mall where the Microsoft store used to be, on your left if you're standing at the bottom of the AMC Theater escalator. Join us on Sunday for an hour of uninterrupted wordmaking! • What we'll do 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 noon on Sundays. 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: 12:00 - quick intros. 12:10 - timer starts: write for 1 hour. 1:10 - chat / take off / keep writing. OPTIONAL SOCIALIZING happens at 1-1:30ish. 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. If you were on time, please be willing to make room for the friendly latecomer. Happy writing and I look forward to seeing you! • What to bring Whatever you need to be able to write! Bring earbuds/earplugs if you want to block noise or the occasional conversation by other patrons. Electrical outlets are limited, so charge your devices before whenever possible. See you at The Café on Sunday!

Sleep in on Sundays. When you've had your fill of pajama-time, roll out and have some tasty brunch with your fellow Humanists!

We'll meet at The Capital One Café, 167 Easton Town Center, Space A-103. This is in the main mall where the Microsoft store used to be, on your left if you're standing at the bottom of the AMC Theater escalator. Join us on Saturday for an hour of uninterrupted wordmaking! • What we'll do 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 10AM on Saturday 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: 10:00 - SESSION 1: quick intros. 10:10 - timer starts: write for 1 hour. 11:10 - chat / take off / keep writing. OPTIONAL SOCIALIZING happens at 11A-11:30ish. 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! • What to bring Whatever you need to be able to write! Bring earbuds/earplugs if you want to block noise or the occasional conversation by other patrons. Electrical outlets are limited, so charge your devices before whenever possible. See you at The Café on Saturday!

If you are interested in selecting investment choices for your 401(k) or other workplace savings plan, minimizing your income tax liability, or identifying the most effective investments for your brokerage account, we are the group for you. We are a local chapter of Bogleheads**®**, whose investment strategy can be found here: https://www.bogleheads.org/wiki/Bogleheads%C2%AE_investment_philosophy Or you can peruse the Boglehead forum here: https://www.bogleheads.org/index.php I look forward to seeing you there. Mark Vonder Haar