Self-Defense

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)**

Onze meetups zijn speciaal voor testers die verder willen kijken dan alleen scripts schrijven. De talks zijn door testers, voor testers. Interactief, laagdrempelig en gezellig. We doen niet aan basisintro's of verkooppraatjes maar gaan voor scherpe inhoud (én lekker eten en drinken :-)). *[let op: aanmelden op deze pagina https://heeyoo.nl/blog/qa-meetup-utrecht-25-feb/ of email thomas.wattel@heeyoo.nl]* Deze avond wederom twee uiteenlopende talks op de agenda, hieronder beide talks iets verder uitgewerkt: Talk 1: **Van functioneel naar performance testen binnen je team** Performanceproblemen komen vaak pas laat aan het licht. In de testfase, of nog vervelender: in productie. Terwijl je als tester al veel eerder signalen kunt oppikken. In deze talk laat Nico zien hoe je de stap maakt van puur functioneel testen naar performance testen. We kijken naar hoe je bestaande geautomatiseerde testen kunt inzetten om performance inzichtelijk te maken. Wat kun je realistisch automatiseren? Waar ligt de grens? En hoe zorg je dat performance echt onderdeel wordt van het werk van het ontwikkelteam zelf? Praktisch, herkenbaar en gericht op ownership. Concrete handvatten om performance structureel mee te nemen in je dagelijkse testwerk. Talk 2: **Testautomation in een microservice architectuur: uitdagingen en oplossingen** Microservices beloven snelheid en flexibiliteit, maar maken testautomation er niet per se eenvoudiger op. Waar test je precies? Op welk niveau? En hoe voorkom je dat je test suite net zo complex wordt als je landschap? In deze talk duikt Erik in het toepassen van testautomation binnen een microservice architectuur. Wat zijn de meest voorkomende uitdagingen zoals afhankelijkheden tussen services, testdata en het behouden van vertrouwen in je tests. Geen ideale wereld, maar een talk met oplossingen en praktijkvoorbeelden. Vragen waar we mee aan de slag gaan: Wat gaat vaak mis? Welke keuzes helpen juist? En hoe zorg je dat je teststrategie meegroeit met je architectuur in plaats van erachteraan loopt? **Tijdstip:** Inloop vanaf 17:00u, start om 18:00u en we ronden af om 21:00u **Locatie:** Newtonlaan 201. Er is ruim voldoende parkeergelegenheid in de garage vanaf 16:00u. **Aanmelden:** Meld je aan op deze pagina https://heeyoo.nl/blog/qa-meetup-utrecht-25-feb/ of email thomas.wattel@heeyoo.nl

**Zin om even helemaal offline te gaan voor een avond?** Doe mee met onze offline hangout. Of je nu alleen komt of samen, je maakt gegarandeerd nieuwe connecties! **Wat kan je verwachten:** 🎨 Speel (bord)spelletjes, knutsel of relax met een goed boek 📚 Een nostalgische avond in een gezellig café 🎈 Ontmoet nieuwe mensen op de ouderwetse manier 📰 Schrijf met onze vintage typemachines Gratis entree! **Waar?** Bunk Utrecht (Catharijnekade 9, Utrecht) **Wanneer?** Woensdag, 25 februari (vanaf 19:00)

Hi there! Tonight we'll have fun over a nice game of pool. From clueless to amateur, all levels are welcome - the important thing is to enjoy and socialize in our beautiful rainbow community 🌈. The meetup will start at 20:30 and is expected to end around 23:00 (but as always, the duration can be extended if we wish to). ✨️ Don't forget to follow us on Instagram: @utrecht.lgbt ✨️ Looking forward to seeing you all soon! 🤍🩷🩵❤️🧡💛💚💙💜🤎🖤

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

Join in for a some drinks (and food, if you want) after work at **The 5th \| Utrecht**. Bring your own project and payment for drinks. As evenings tend to be a bit busier, we'll reserve a table. This means: **Only sign up if you are sure you will come!** And if there's no space left on the event, please don't join spontaneously. \-\-\-\-\- As always, we talk about our projects, exchange tipps, but also just get to know each other and enjoy a drink after a long day in good company. Whether it's knitting, crocheting, stitching, origami, or something more unique, we're looking forward to seeing you!

**(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)

This meetup explores key ideas from \*\*Jordan Peterson’\*\*s book Beyond Order, focusing on how people find meaning, stability, and direction in a complex and uncertain world. Where his first book, "**12 Rules for Life"**, emphasised structure and discipline, his follow-up, "**Beyond Order**", looks at what happens when life becomes too rigid — and how growth often requires stepping into uncertainty while still taking responsibility for our actions. The themes are psychological and practical rather than political. **We’ll discuss topics such as:** * The balance between order and chaos in everyday life * Responsibility as a source of meaning * Truth, integrity, and self-honesty * Limits, discipline, and self-respect * Choosing meaningful difficulty over comfort This is a guided conversation, not a lecture or debate. It would be nice if those who attend also read the book, but it's not necessary — curiosity and personal reflections are also welcome. Disclaimer: This is not therapy and not a political discussion. **Who’s this for?** Anyone interested in psychology, personal responsibility, and meaning-making. First-timers are welcome. No prior knowledge of Jordan Peterson or the book is required. **Why pay for the event?** I have to reserve a table at a restaurant, they expect that we at least drink something, so your reservation includes a drink, whether it is tea, coffee or cola.

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!

**🟢🟢 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! 🎨👩🏼‍🎨👨🏼‍🎨👩🏼‍🎨🧑🏼‍🎨🎈**

This circular walk begins at Nijmegen Heyendaal train station and takes us through some forests to the south of Nijmegen. We’ll walk through Brakkenstein park, then a tranquil botanical garden (Stichting Hortus), then into the Dekkerswald woodland estate. Further south we will walk through the north part of the Groesbeekbos and stop for refreshments at the Boscafé de Zweef. Then we walk northward again through the pine forests of the Heumensoord and the leafy University grounds to get back to the station. The walk is mostly flat, but features mostly rough/uneven paths so it is recommended to wear sturdy walking shoes. As always, remember to bring water and maybe some snacks.

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.

**Ensō Brunch & Flow: Zouk Boot Camp** Sunday March 1, 2026 You decide what to pay. All proceeds support future events, and tips are paid directly to artists. Connect with new friends and dance family over brunch and leave ready to take on the dance floor! Beginners welcome or come to sharpen your skills. No partner, no problem. We suggest bringing a water bottle and non-grippy shoes to wear. **Agenda** **11:30 AM - 1:00 PM** - **Registration, Brunch & Mingle** * We'll be bringing the mimosas, and invite you to bring your favorite brunch food to share. **1:00 PM - 2:30 PM** * Rhythm & body alignment * Partner connection * Linear basic * Viradinha **2:30 PM - 3:00 PM** \- Rest\, hangout\, & practice **3:00 PM - 6:00 PM** * Lateral * Basic turns * Soltinho * Homework & Guided Practica 2390 Harper Isabelle, Columbus, OH The clubhouse is located next to the dog park. Don’t forget to sign in when you arrive! Present. Connected. Beautifully Imperfect. We are **Ensō** dancers

We are a real world Martial arts group. \ Called DO JUNG ISHU (the art of fighting) \ Based off of Jeet kune do we just continued where Bruce Lee left off. \ We have been around a while. \ We are donation based. Every week we get together and work technical skills and live pressure testing. \ Almost all of the instructors have been in everything from altercations in the real world to the ring and some still compete in the cage. \ If you want to take your skills up, improve your confidence, gain self defense skills, get in better shape, test yourself or just want to kill some time and possibly get hit a bit come on down. \ We will be located at 3923 N High St, Columbus, OH 43214 inside the whetstone rec center in the auditorium, upstairs in classroom B or outside in the grass between the playground and horseshoe area. our instructors are normally in a black and red art of fighting shirt \ if you can not find us call or text me at 6143570295 Saturday 1pm Wednesday 5:30pm From Age 16 and up. attendees under the age of 18 must have a guardian with them. \ \ You must have a free leisure card for the rec center and must be registered for our class specifically .\ Wear workout clothing \ Bring a MOUTHPIECE! \ WE HAVE GLOVES. \ Hope to see you soon :-).\ We are run off of donations. \ let me know if you have any questions :)

This is an in-person meeting. Would you like to know the Real You, not just a shadow of yourself? Does your life energy feel somehow trapped within? Does your self-confidence get easily shaken? Do you get in the way of your own goals? We will discuss the real source of all this, what holds you back in life, and how to handle it so you can achieve more successful and happier living. Perhaps you get weighed down with negative emotions you can't seem to shrug off. Or find yourself doing strange and irrational things - not really being yourself. We will cover why that is and tools that work to help you unearth your self, your self-confidence and motivation. This meeting will help you learn about how to effectively overcome: -Out-of-control unwanted emotions -Low self-esteem -Anxiety -Negativity -Stress -Irrational fears -Traumatic or painfully emotional incidents -Breakups -Betrayals -Feeling like you're not really yourself -Self-doubt... We will discuss how to unleash the inner you and tap into your true potential. So come to this online meetup! This meeting is sponsored by the Hubbard Dianetics Foundation of Central Ohio

We are a real world Martial arts group. \ Called DO JUNG ISHU (the art of fighting) \ Based off of Jeet kune do we just continued where Bruce Lee left off. \ We have been around a while. \ We are donation based. Every week we get together and work technical skills and live pressure testing. \ Almost all of the instructors have been in everything from altercations in the real world to the ring and some still compete in the cage. \ If you want to take your skills up, improve your confidence, gain self defense skills, get in better shape, test yourself or just want to kill some time and possibly get hit a bit come on down. \ We will be located at 3923 N High St, Columbus, OH 43214 inside the whetstone rec in the auditorium, center upstairs in classroom B or outside in the grass between the playground and horseshoe area. our instructors are normally in a black and red art of fighting shirt \ if you can not find us call or text me at 6143570295 Saturday 1pm Wednesday 5:30pm From Age 16 and up. attendees under the age of 18 must have a guardian with them. \ \ You must have a free leisure card for the rec center and must be registered for our class specifically .\ Wear workout clothing \ Bring a MOUTHPIECE! \ WE HAVE GLOVES. \ Hope to see you soon :-).\ We are run off of donations. \ let me know if you have any questions :)

We are a real world Martial arts group. \ Called DO JUNG ISHU (the art of fighting) \ Based off of Jeet kune do we just continued where Bruce Lee left off. \ We have been around a while. \ We are donation based. Every week we get together and work technical skills and live pressure testing. \ Almost all of the instructors have been in everything from altercations in the real world to the ring and some still compete in the cage. \ If you want to take your skills up, improve your confidence, gain self defense skills, get in better shape, test yourself or just want to kill some time and possibly get hit a bit come on down. \ We will be located at 3923 N High St, Columbus, OH 43214 inside the whetstone rec in the auditorium, center upstairs in classroom B or outside in the grass between the playground and horseshoe area. our instructors are normally in a black and red art of fighting shirt \ if you can not find us call or text me at 6143570295 Saturday 1pm Wednesday 5:30pm From Age 16 and up. attendees under the age of 18 must have a guardian with them. \ \ You must have a free leisure card for the rec center and must be registered for our class specifically .\ Wear workout clothing \ Bring a MOUTHPIECE! \ WE HAVE GLOVES. \ Hope to see you soon :-).\ We are run off of donations. \ let me know if you have any questions :)

Wouldn’t it be nice to find a way to overcome your feelings of anger so that you not only control them, but you no longer have the urge to lose your temper in the first place? And how about being able to shake off resentments, persistent annoyance, or even feelings of vengeance? We’d like to invite you to an event on how to overcome anger and resentment. We will show you why people have trouble controlling their temper and where resentment comes from. Flaring anger can ruin a meeting, a relationship, an opportunity, or just about any aspect of life. Worst of all, outbursts towards our family can create hurt that lingers throughout a lifetime. You want to have a civil conversation, and you’ve vowed that you wouldn’t lose your temper, but a few minutes later, the anger flares up. Maybe you’ve realized that being angry doesn’t get you what you want so you internalize it. Or maybe you avoid the knockdown, drag-out fights, but stewing in resentment is exhausting and takes an emotional toll. In this event we show you how to get to the root of your anger so that it stops being an issue to you. You’ll also learn why people harbor resentments and how to move on. Don't continue to struggle, make a difference in your life, and join us for this local event. Be sure to click on the red "Attend" button below to come to the event. We look forward to seeing you there. This Meetup is sponsored by your local Dianetics and Scientology Life Improvement Center.