GIS

Come along, lovely queer hikers! 🌿✨ This time we’re serving an easy-going queer nature moment with a short loop through **Landgoed Heidestein** near Zeist. Think dreamy forest paths, shimmering fens, a peaceful forest pond, and heather fields - a lot of diversity for such a short walk :) We’re teaming up with **Cocktail (COC’s group for LGBTQIA+ refugees & asylum seekers)** for this event, so besides soaking up nature, we’re creating space for connection, sharing stories, and learning from each other’s journeys and experiences. Expect a vibe that’s part hike, part picknick, part wholesome community exchange. 🌈 Bring your snacks and blankets, as we’ll pause along the way for a relaxed picnic moment together. Because queer joy isn’t just about where we go, but who we walk with. 💖 **Practical info** 📏 **Distance:** 5 or 7 km (loop walk) 📍 **Start:** Bus stop Prinses Margrietlaan, Zeist (5km option) Driebergen-Zeist station (7km option) 🏁 **End:** Back at the starting point 🥾 **Level:** easy - chill pace 🤝 **Meeting point:** outside the train station **Driebergen-Zeist at 13:45** or bus stop **Prinses Margrietlaan (Zeist) at 14:20** ❗You’re welcome to join from another direction. If you come by car you can park at P+R Driebergen-Zeist. Please note: we published this hike with Cocktail simultaneously, which is also why we lowered the participant number from Hiking Queer NL's side. Pack your: 🍱 snacks 🚰 water 🧥 rain coat/umbrella ☀️ sun screen 🏳️‍🌈 anything else you might need ❌ If you signed up and cannot make it in the end, please cancel your RSVP attendance so we know how many people will show up and someone else can take your place instead. 💗 A voluntary donation helps us to keep the Meetup group up and running :) you can either pay via a Tikkie or in cash after we finish the hike. *Hiking Queers Netherlands & Cocktail (COC)*

Donderdag 21 mei 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 pakken we het aan als een conferentie in het klein. Drie sprekers, drie verhalen, één middag – drie verhalen voor de prijs van één. Wat kun je verwachten? **Dirk neemt een kijkje onder de motorkap van AI** AI voelt voor veel mensen als magie. In deze talk probeer ik de magie weg te nemen door een kijkje te nemen onder de motorkap. Een essentieel bouwblok van moderne AI is een neuraal netwerk. Als je begrijpt hoe een neuraal netwerk werkt, is het een stuk makkelijker om te begrijpen hoe en waarom een LLM werkt. De beste manier om iets te begrijpen is door het te bouwen, vanaf scratch. Dus dat gaan we in deze talk doen. Door dat te doen leren we over artificial neurons, activation functions, backpropagation en meer. **George vertelt hoe AI Cyberaanvallen verandert** George Schizas (extern), voormalig IT Manager, nu werkzaam als CISO, vertelt over zijn ervaringen in de Cloud Cyber Security en hoe hackers met behulp van AI nieuwe aanvalsmethoden kunnen gebruiken om kwetsbaarheden op te sporen en te exploiteren. Hij geeft voorbeelden van manieren om in Kubernetes omgevingen in te breken en noemt manieren om dit tegen te gaan. **Roland duikt in de wereld van de fraude fabriek** Als ontwikkelaar kom je dagelijks in contact met technologie en de laatste jaren natuurlijk ook vaak met AI. JIJ snapt heel goed wat de voordelen en de gevaren zijn, maar hoe leg je complexe onderwerpen als AI gegenereerde afbeeldingen, Voice Phishing en Hallucinaties uit aan je ouders, de buurvrouw, of je kinderen? Ik neem jullie mee in een realistische situatie waarin Anna en haar familie opgelicht wordt met behulp van verschillende technieken en hoe dit oplichters-landschap met behulp van AI verandert. **Wanneer:** Donderdag 21 mei 2026 **Wat:** Techday – conferentie-editie “AI kansen en valkuilen” **Voor wie:** Iedereen (!) die nieuwsgierig is en wil leren **Agenda** 14:45 - 15:00 - Inloop 15:00 - 16:00 - Neurale netwerken 16:15 - 17:15 - AI risico’s en kansen 17:15 - 18:00 - Eten 18:00 - 18:45 - Fraude fabriek We zien je graag op de Techday!

(english/german below) **Bitcoin Pizza Dag!** Op 22 mei 2010 betaalde programmeur Laszlo Hanyecz 10.000 BTC voor twee pizza's — de eerste gedocumenteerde aankoop met bitcoin. Hij plaatste een bericht op een forum waarin hij BTC aanbood voor pizza; een andere gebruiker ging akkoord, bestelde de pizza's en leverde ze af. Die transactie werd later bekend als "Bitcoin Pizza Day". Laszlo bewees dat Bitcoin als ruilmiddel gebruikt kan worden. **Sluit je bij ons aan voor pizza-avond bij De Pizzabakkers! (vanaf 18:00)** RSVP zo snel mogelijk; we moeten reserveren bij De Pizzabakkers en er is beperkte plek. Zorg dat je je geladen Lightning-wallet meeneemt! *** **English: Bitcoin Pizza Day!** On May 22, 2010, programmer Laszlo Hanyecz paid 10,000 BTC for two pizzas — the first documented purchase using bitcoin. He posted on a forum offering BTC for pizza; another user accepted, ordering pizzas and delivering them. That trade later became famous as "Bitcoin Pizza Day," Laszlo proved that Bitcoin can be used as a medium of exchange. **Join us for pizza diner at De Pizzabakkers! (from 18:00)** Please RSVP as quick as possible as we need to make a reservation at De Pizzabakkers and there is only limited space. Be sure to bring your loaded lighting wallet along with you! *** **Deutsch: Bitcoin Pizza Tag!** Am 22. Mai 2010 zahlte Programmierer Laszlo Hanyecz 10.000 BTC für zwei Pizzen — der erste dokumentierte Kauf mit Bitcoin. Er postete in einem Forum und bot BTC für Pizza an; ein anderer Nutzer akzeptierte, bestellte die Pizzen und lieferte sie aus. Dieser Tausch wurde später als "Bitcoin Pizza Day" bekannt. Laszlo bewies, dass Bitcoin als Tauschmittel verwendet werden kann. **Begleite uns zum Pizza-Abend bei De Pizzabakkers! (ab 18:00)** Bitte antworte so schnell wie möglich; wir müssen bei De Pizzabakkers reservieren und es gibt nur begrenzten Platz. Nimm unbedingt deine geladene Lightning-Wallet mit!

**RSVP here via EventBrite [here](https://www.eventbrite.nl/e/you-and-your-brand-a-casual-networking-hour-tickets-1984283125243).** Expand your visibility. Join a casual online time to share about you, your brand and business, and learn more about other business owners, locally and globally. Share upcoming events and workshops, too. After each business owner gets the spotlight to share, we then move into a topic-oriented discussion. This month, the topic is begin chosen by [Isabella Maria Noguera, MSc](https://www.linkedin.com/in/isabellamarianoguera/) over of Be Your Brand Consulting. Every session closes with gratitude and a creative activity, so have a pen and paper, tablet, or something available in case we write/create/draw. **RSVP here via EventBrite [here](https://www.eventbrite.nl/e/you-and-your-brand-a-casual-networking-hour-tickets-1984283125243).** *-* *\*\*\*The only requirements are a minimum age of 18 years old, be a business owner or preparing to launch,* *and **at least three attendees** register to make it a worthwhile hour for everyone.\*\*\**

We'll start into the weekend with some Sport and what is better than having a bike tour on Friday 22nd May? If you'd like to bike along, sign up here! We expect this to take about 4 to 5 hours. On the route, we will see at least two beautiful castles, and we’ll have a pause in Breukelen where we will get a snack! **This tour is for everyone. You don't have to prepare anything, it's enough to be at the bike rental at the time.** The following information is for the curious: You can see the [tour](https://www.komoot.com/de-de/tour/2884792439?share_token=aCVbZHeYrkmmS52GP5uwrR7Q3EweCrOv65hA2MpYgtf4nSaL8V&ref=wtd) on the app [Komoot](https://www.komoot.com/). It's approx. 46km, **we may adapt it as a group on the day. As last year we’re very flexible and adaptive!** The bike rental is payed by Stichting Rust Nederland. Many thanks to Erik Jonkers for the sponsoring and to Jana Dönszelman for helping with the meetup page and organization. **Agenda** 1. We'll meet at the bike [rental place](https://willemstraatbike.nl/contact/) it is near to the conference venue. (5 Minutes by bike) 2. Everyone receives their bike. 3. We’ll go over “Hogeweidebrücke” 4. We’ll see Kasteel Nijenrode and get a snack at the marketplace of Breukelen 5. We’ll see Schloss Zuylen 6. We ride back to Utrecht and return the bikes! Looking for more fun things to do during RustWeek? Take a look at our activities page: [https://2026.rustweek.org/events/social-activities/](https://2026.rustweek.org/events/social-activities/)

Join our new group’s third meeting. Meet fellow tech enthusiasts west of the beltway. ​Because our group is new, we have a poll for the direction we want to take this new group. ​[https://submatrix.net/article/Meetups/e9ym4fr8Ca](https://submatrix.net/article/Meetups/e9ym4fr8Ca) ​For this event, we will be running a working meetup. ​Our meetings are a great place to work on and show off what you do. We are always welcoming. ​Our format is great for people who have started on but not finished one or several side projects. ​We will start off with basic introductions and what we are working on and what our goals are. We’ll break the rest of the meeting into two working sessions. In between, we’ll do a quick check-in to see how folks are going. If the RSVP is full, come anyway. We'll likely have space.

This **no gi class** focuses on **[Brazilian Jiu-Jitsu](https://en.wikipedia.org/wiki/Brazilian_jiu-jitsu) (BJJ) concepts**, including **takedowns**, **positional drilling**, **submissions**, **transitions**, **situational sparring**, **strategy development**, and **live training**. While the class is scheduled for **90 minutes**, it may run longer depending on content and participation. This class includes both **instruction** as well as [rolling](https://www.howbjjworks.com/bjj-blog/2018/7/29/how-rolling-works-in-bjj) (**sparring**) and a **question-and-answer** section. **Some of the topics covered in this class include:** 🤼 **Wrestling** \-\- Takedowns\, ties\, and controlling the stand\-up game using wrestling fundamentals adapted for no gi BJJ competition and self\-defense\. 🤼 **Catch Wrestling** \-\- A traditional grappling system emphasizing submissions and relentless pressure \-\- [catch wrestling](https://en.wikipedia.org/wiki/Catch_wrestling) concepts add a ruthlessly practical dimension to no-gi BJJ. 🥋 **Judo adapted to no gi BJJ** \-\- Classical [Judo](https://en.wikipedia.org/wiki/Judo) throws and **off-balancing principles** translated into a no-gi context, giving grapplers a powerful and often underused takedown arsenal. 🧠 **[Constraints-Led Approach](https://www.bjjmentalmodels.com/constraints-led-approach) (CLA) to learning and games** \-\- A modern\, evidence\-based coaching methodology that uses structured games and constraints to accelerate skill acquisition naturally and intuitively\. 📌 **Pins** \-\- Controlling and maintaining dominant positions on the ground \-\- [pins](https://en.wikipedia.org/wiki/Pin_(sport_wrestling)) are the foundation of effective ground fighting and set up submissions, transitions, and pressure. 🔒 **Submissions** \-\- Chokes\, arm locks\, and [finishing techniques](https://en.wikipedia.org/wiki/List_of_Brazilian_jiu-jitsu_techniques#Submissions_(Most_Frequent_in_UFC_%E2%80%93_Sorted_by_Frequency)) applied from dominant positions -- the ultimate objective of BJJ ground fighting. 🦵 **Leg locks** \-\- Heel hooks\, kneebars\, ankle locks\, and toe holds \-\- [lower body submissions](https://en.wikipedia.org/wiki/Leglock) that are increasingly central to high-level no gi competition. 🔄 **Guard passing and guard retention** \-\- The core positional chess match of BJJ \-\- learning to break through an opponent's guard while protecting your own is fundamental to controlling a match\. ⚖️ **Kuzushi (off-balancing)** \-\- The Japanese principle of [disrupting an opponent's balance](https://en.wikipedia.org/wiki/Kuzushi) before executing a throw or takedown -- a concept borrowed from Judo that dramatically improves takedown success rates. 🔥 **Pressure and cooking opponents** \-\- Using body weight\, positioning\, and [relentless forward pressure](https://bjjfanatics.com/blogs/news/pressure-bjj) to physically and mentally exhaust opponents -- a high percentage strategy at all levels. The **drop-in fee** for non-members is **$20** and can be **paid on-site**, or **[sign up for a week of training for free](https://www.pedrosaueracademy.com/).**

***¡¡¡ Pura Vida !!!*** Come alone, leave with friends! This is what Meetup is all about. Being able to join and do what you wanted to do . . just not alone. We are going to Costa Rica for 9 nights/10 days of exploration and tropical adventures. . . . **Best Meetup ever!**! To see how fun it is . . . Here are photos from when we did go before [https://photos.app.goo.gl/cswRyeNZp1r6WW9t9](https://photos.app.goo.gl/cswRyeNZp1r6WW9t9) Costa Rica is a playground for the adventurous and an eco-tourist's dream! It is an unspoiled tropical paradise. * Beautiful beaches * Rainforest biodiversity * Misty volcanoes * Roaring rivers * Lush jungles * Exotic flora and fauna * And more!! **And we are going there to enjoy it, learn about it and make memories of a lifetime!** This event is a true Meetup. We are creating it from scratch, and bringing like-minded people together on this adventure. Along the way making lifelong memories and friendships. Together . . . let’s make a Meetup to remember! * Hike around the base of the Arenal Volcano * Selvatura Zip Line Canopy Tour * Guided visit to Finca Luna Nueva Farm * Caño Negro Refuge Tour/Visit * Rio Frio Wildlife Refuge Boat Tour * Hanging Bridges Walking Tour * Ecotermales Hot Springs * Monteverde Night Walk Tour * Monteverde Cloud Forest Reserve Tour (daytime) * River Floating Tour * Tamarindo Beach * Sunset Sailing * Snorkeling Tour * And more! For a detailed Day By Day itinerary **[Click Here](https://forms.gle/cQdqYw74gAYqphXX8)**[ to fill out our info request form](https://forms.gle/cQdqYw74gAYqphXX8) **Land Tour cost $3350 per person, double occupancy** (we match roommates for those traveling solo, and most of us are doing just that). If you want your own room: **Solo occupancy additional $950** The only way to secure your spot for this meetup is a $300 deposit that is refundable up to 90 days before departure. **[Click here for secure deposit link](https://www.paypal.com/instantcommerce/checkout/24X2UREP9XPKC)** When you make a deposit be sure to fill out this [ATTENDEES FORM](https://docs.google.com/forms/d/11uywUNCIB5ONrpZ-gU_4mk3bvpc4p_nhhL3ewsbkC5A/edit)**.** As we mentioned, . . . the cost is $3350. This is for the "Land" portion only. Airfare is not included. This gives you the flexibility to have a flight with timing that works best for you. Or to use points/miles. I can also help arranging your airfare. To receive an offer, **[CLICK HERE and send me a message.](https://secure.meetup.com/messages/?new_convo=true&member_id=14363992)** **What is Included in this trip:** * **9 Nights hotel accommodation** * **9 breakfasts, 4 lunches, 2 dinners.** * **Meet & Greet at the airport.** * **Pick-up from airport to our hotel, and hotel to airport at the end of the trip** * **Transportation throughout the trip** * **Private naturalist English speaking tour guide** * **All entrance fees and tours mentioned in the itinerary day-by-day description** * **Daily water bottles for the group** * **Hotel and Added Value Tax** Does not include: ***x*** *International Airfare* ***x*** *Meals other than specified* ***x*** *Optional Tours* ***x*** *All items of personal nature (telephone calls, Laundry, room service, etc.)* ***x*** *Tipping for tour guides and drivers* **Want more info?** **[Click Here to fill out our info request form](https://forms.gle/cQdqYw74gAYqphXX8)** **OR** **RSVP to the event with your email to receive additional info.** **OR** **[CLICK HERE to send me a message](https://secure.meetup.com/messages/?new_convo=true&member_id=14363992)** Whatever is easiest for you! *Still have questions?* **We do a Q & A Zoom once a month.** **[CLICK HERE](https://www.meetup.com/moretoexplore/events/296044209/)** for our Q & A Zoom. RSVP on that event to get a reminder for the zoom. [Click here for the ](https://www.meetup.com/moretoexplore/events/305233138/)**[MAIN ](https://www.meetup.com/moretoexplore/events/288444641/)[location of this event on Meetup](https://www.meetup.com/moretoexplore/events/305233138/)** RSVP there to post any discussion and to get notice of any comments and discussions. As well as any updates and reminders **We believe in good decent social.** **SOT 2000318-10** **[Click Here to see all our other events](https://www.meetup.com/CulturalArts/Events)**

This **no gi class** focuses on **[Brazilian Jiu-Jitsu](https://en.wikipedia.org/wiki/Brazilian_jiu-jitsu) (BJJ) concepts**, including **takedowns**, **positional drilling**, **submissions**, **transitions**, **situational sparring**, **strategy development**, and **live training**. While the class is scheduled for **90 minutes**, it may run longer depending on content and participation. This class includes both **instruction** as well as [rolling](https://www.howbjjworks.com/bjj-blog/2018/7/29/how-rolling-works-in-bjj) (**sparring**) and a **question-and-answer** section. **Some of the topics covered in this class include:** 🤼 **Wrestling** \-\- Takedowns\, ties\, and controlling the stand\-up game using wrestling fundamentals adapted for no gi BJJ competition and self\-defense\. 🤼 **Catch Wrestling** \-\- A traditional grappling system emphasizing submissions and relentless pressure \-\- [catch wrestling](https://en.wikipedia.org/wiki/Catch_wrestling) concepts add a ruthlessly practical dimension to no-gi BJJ. 🥋 **Judo adapted to no gi BJJ** \-\- Classical [Judo](https://en.wikipedia.org/wiki/Judo) throws and **off-balancing principles** translated into a no-gi context, giving grapplers a powerful and often underused takedown arsenal. 🧠 **[Constraints-Led Approach](https://www.bjjmentalmodels.com/constraints-led-approach) (CLA) to learning and games** \-\- A modern\, evidence\-based coaching methodology that uses structured games and constraints to accelerate skill acquisition naturally and intuitively\. 📌 **Pins** \-\- Controlling and maintaining dominant positions on the ground \-\- [pins](https://en.wikipedia.org/wiki/Pin_(sport_wrestling)) are the foundation of effective ground fighting and set up submissions, transitions, and pressure. 🔒 **Submissions** \-\- Chokes\, arm locks\, and [finishing techniques](https://en.wikipedia.org/wiki/List_of_Brazilian_jiu-jitsu_techniques#Submissions_(Most_Frequent_in_UFC_%E2%80%93_Sorted_by_Frequency)) applied from dominant positions -- the ultimate objective of BJJ ground fighting. 🦵 **Leg locks** \-\- Heel hooks\, kneebars\, ankle locks\, and toe holds \-\- [lower body submissions](https://en.wikipedia.org/wiki/Leglock) that are increasingly central to high-level no gi competition. 🔄 **Guard passing and guard retention** \-\- The core positional chess match of BJJ \-\- learning to break through an opponent's guard while protecting your own is fundamental to controlling a match\. ⚖️ **Kuzushi (off-balancing)** \-\- The Japanese principle of [disrupting an opponent's balance](https://en.wikipedia.org/wiki/Kuzushi) before executing a throw or takedown -- a concept borrowed from Judo that dramatically improves takedown success rates. 🔥 **Pressure and cooking opponents** \-\- Using body weight\, positioning\, and [relentless forward pressure](https://bjjfanatics.com/blogs/news/pressure-bjj) to physically and mentally exhaust opponents -- a high percentage strategy at all levels. The **drop-in fee** for non-members is **$20** and can be **paid on-site**, or **[sign up for a week of training for free](https://www.pedrosaueracademy.com/).**

We will be meeting at Starbucks to learn together. Come with an online class you're already going through or an interest and we will try to connect you with a course where you can learn it. Already have a skill you want to contribute to a Kaggle Datascience competition? We will work on these too! Laptop required :)

This class will provide instruction into various concepts of **Jiu-Jitsu** as a form of **martial art**. Participants will have the opportunity to **study**, **practice**, and **experiment** with **submission holds** and **strategic fighting controls** that are the hallmark of the now famous methodology of Professional MMA athletes and professional combatives users. This **gi class** is held every **Tuesday** and **Thursday** and includes **one hour of instruction** and **30 minutes** (sometimes longer, TBD) of **open training**. Gis are available if you need one. Drop-in fee for non-members is **$20** which which can be paid on-site. Note that we are in **Suite #130**.

**Chantilly Carb Crawl: Asian Breads & Pastries** **🍞** **Whether you’re a long-time member or this is your very first event, come with us on a mini-tour of 3 of Chantilly’s hidden gems. It’ll be a fun chance to reconnect, meet new members and enjoy some amazing breads and pastries!** **The Game Plan** ***11:00 AM — Café Moment*** **We’ll kick things off at this new cafe specializing in** **Korean Salt Bread. If you’ve never tried it, imagine eating a warm, buttery, fluffy cloud (yes, I am drooling as I write this)** **Next, we’ll head over to Mahiwaga for some warm, freshly baked** **Pandasal. If you’ve never had this Filipino classic fresh from the oven, this father/daughter team** **make** **some of the best!** **We’ll wrap up with a stop across the hall at Toimoi Bakery for their famous** **pandan and banana pudding filled croissants** **🥐.** **Can't wait to see you there! RSVP to save your spot!** [Cafe Moment](https://www.instagram.com/reel/DX-C-Hmhg7g/?igsh=dHd4N2RodWwwaHo1) [Mahiwaga](https://www.instagram.com/reel/DXiCy0Gz0P5/?igsh=Mm45a2c3ZWJtM2pv) [ToiMoi Bakery ](https://www.instagram.com/reel/DX0O-2KuRiT/?igsh=MWh2bjN4cHE1am55eg==)