Java Virtual Machine

We are a group of runners who meet most weeks for a run around the beautiful Vltava River's edge. You can bring your running shoes straight from the office/home office if you don't have time to stop at home. There will be a place to put your bags in the Cafe. We will run about 9 km along the river and have a drink afterwards. Paces vary! We will meet in the square near Kavarna Liberal (Hermanova 6), near the Vltavska metro/tram stop at 6:30 on Wednesday. See you there!

In this workshop you will learn to make your own mini (25×25) or small rug (30×40) from scratch! No experience needed and all material provided. Feel free to join alone and meet people on the spot or bring a friend and share the fun! **Due to limited spots reservations are mandatory** - get your ticket on our website: www.tuftingprague.com/bookings Workshop is held in Letna, Kostelni 32.

**Ackee meets: Vol. 4 je tady! 🤘** 2026 jsme vyhlásili jako rok Ackee Multiverse. ✨🔮 Ten otevíráme tím největším crossoverem – **Mobile Development. ⚔️ iOS & Android na jednom místě.** Jak dnes v Ackee přemýšlíme o **multiplatformním vývoji**? Svět nejen mobilního vývoje se mění rychleji než kdy dřív a hranice mezi (kdysi rivalskými) tábory se stírají. Přijďte na další Ackee Meets, kde pokecáme o tom, jaké to je, **bořit zdi mezi iOS a Androidem**, jestli **Swift brzy ovládne konkurenční platformu** a jak bezpečně **integrovat KMP do obří bankovní aplikace**. 🎯 👉 Žádná teorie z učebnic, jen **čistá praxe, fuckupy a zkušenosti** z první linie Ackee projektů. 🚫 **Kapacita je omezená – registrujte se zdarma přes [Eventbrite](https://www.eventbrite.com/e/ackee-meets-mobile-development-ios-android-tickets-1981931329960).** Interakce tady na meetupu nestačí. **CO NÁS ČEKÁ:** **📣 Jak jsme v Ackee zbořili zdi mezi iOS a Androidem (z pohledu iOSáka)** 🎤 *[Rostislav Babáček](https://www.linkedin.com/in/rostislavbabacek/)*, Mobile Developer Jak vypadá přerod kovaného iOSáka v univerzálního mobile developera, který dodává KMP features? ? Podíváme se na dopad každodenní workflow – od boje s cizím IDE, přes rozdíly mezi Swiftem a Kotlinem i mezi Androidem a iOSem, až po dilema, co vše do KMP (ne)patří. Dozvíte se, co nám pomohlo se s tím srovnat a jakou roli v tom hraje správně nakonfigurovaná AI. **📣 Swift pro Android. Je to konec pro KMP?** **🎤** *[Vít Nademlejnský](https://www.linkedin.com/in/nademlejnskyvit/),* Mobile Developer Apple rozvířil vody založením Android Workgroup a představením Swift SDK pro Android. Znamená to konec nadvlády KMP, nebo jen slepou uličku? Podíváme se na aktuální stav tohoto projektu, jeho limity a reálný význam pro dnešní i budoucí multiplatformní vývoj. **📣 Jak (ne)rozbít bankovní aplikaci při integraci KMP** **🎤** *[Petr Polívka](https://www.linkedin.com/in/petr-pol%C3%ADvka-5042311b6/) & [Alexander Grigorov](https://www.linkedin.com/in/alexander-grigorov-808751214/), Mobile Developers* Kotlin Multiplatform slibuje sdílení kódu a jednodušší vývoj – pustit ho ale po 2 letech vývoje do rozjeté bankovní aplikace chce odvahu (nebo dobrý plán). Na jaké problémy jsme narazili a co všechno bylo potřeba vyřešit, aby aplikace zůstala stabilní i při takhle masivní změně pod kapotou? Praktické zkušenosti, tipy i slepé uličky z integrace KMP do aplikace se 170 obrazovkami. * 🗓️ **Kdy**: 25. 2. 2026 od 17:00 * 📍 **Kde**: Ackee, Block Karlín, 6. patro * **💸 Za kolik:** Zdarma **Program:** * 17:00 🚪 Vstup * 17:30 1️⃣ Rostislav Babáček: Boření zdí mezi iOS a Androidem * 18:00 2️⃣ Vít Nademlejnský: Swift pro Android. Konec pro KMP? * 18:30 3️⃣ Petr Polívka & Alexander Grigorov: Jak (ne)rozbít bankovní aplikaci při integraci KMP? * 19:00 🍕 Networking * 21:00 🔚 Konec akce, jde se domů! 🚫 **Kapacita je omezená – registrujte se zdarma přes [Eventbrite](https://www.eventbrite.com/e/ackee-meets-mobile-development-ios-android-tickets-1981931329960).** Interakce tady na meetupu nestačí. Těšíme se! 🤙 *V průběhu akce můžeme pořizovat a dále zpracovávat foto a video záznamy. Pokud si nepřejete, abychom vás fotili nebo natáčeli, dejte nám prosím vědět před začátkem akce.*

🎓 **The Prague FrontEnd Meetup is back in 2026!** Join us on **the last** **Wednesday in February, 25th, at 5:00 PM** in the **Ataccama offices in Karlín** for another evening full of inspiration, great talks, and friendly networking. 👥✨ The lineup: Tomas Belada will be talking about OpenCode - a great open source AI agent. But the real power shows up once you sprinkle a bit of Greek mythology on top. In this talk, I’ll demo a plugin that turns OpenCode into a superpower, an end-to-end coding workflow. Pavel Kepka is experimenting with how the technology stack affects the LLMs - Pavel designed an experiment to evaluate the LLM's architecture decision based on the required technology stack. He'll share his findings and learnings with us at the upcoming Ataccama Meetup. Michal Kopecky will be talking about his MCP-FE library. Michal's annotation says this: Most AI agents are "blind" to your application's internal logic, often relying on messy DOM scraping or raw HTML snapshots. In this talk, I will demonstrate how to bridge React and LLMs natively using the Model Context Protocol. We’ll explore how to give agents direct access to clean component state—such as data grids, active filters, and selections—and enable them to execute actions within the browser. Join me to see how we can transform a simple chatbot into a truly context-aware co-pilot. As always, expect: 🍕 Snacks & 🍺 drinks 💬 Friendly community vibes 💡 Space to learn, share, and connect 👉 **RSVP here to save your spot**

The event is free of charge Join us for an inspiring, hands-on evening to learn about the Amazon. We’ll be screening the movie "Forest Solutions" a 25–30 min documentary that spotlights what’s at stake—from deforestation and fires to the impacts on climate, rainfall, biodiversity, and the Indigenous communities defending the forest. The movie will be in PT-BR, with EN subtitles. And, the event in general will be held in English Also, more information and details about the campaign, and we have been doing as Greenpeace international to protect the Amazon Rainforest, and fight the problems around it, for now you can check our petition webpage if you wish - [http://spolupropralesy.cz/](https://l.facebook.com/l.php?u=http%3A%2F%2Fspolupropralesy.cz%2F%3Ffbclid%3DIwZXh0bgNhZW0CMTAAYnJpZBExbXpYWm9DdnJPVVQ2U1JZaXNydGMGYXBwX2lkEDIyMjAzOTE3ODgyMDA4OTIAAR7vQr87XCgTh7sH3yoF3rVdIrqXMAr8DqSW_y08P6TCEoOH-agN9FvguVNWMQ_aem_VHTGVXSrKOW9TnwfsOqZiA&h=AT1X6uTS1CiNGp8DQ_8yBnCe78rqQ6kqmvrK-7TkNTqi5Af8675PkTIlf0IegGZzYIFdwQZ_wrwDEWWxjHt15BA1CKZdrPhrGw7lTIqLIAxyJUWCfz0_WMYYuGj0NcGo3lxvuD7D6n28WOOH&__tn__=q&c%5B0%5D=AT3v9YmnwovepiNz730TEd4KwlK4jhlEkPK4GVkdUdOVsfXMf3M5RoFepDwMtxifTWF4EBgMPUDdrPE2jFaDy4pdMEsEBxJVoAJI-sY7r_YodeD6mRB-Vcaf8-mu-hJ1kZDjChxnjJPUrauM21NMvOSPwFSMG66l45A) Discussion: After the film, there will be a discussion with Marek Pytlík, Greenpeace campaigner and expert on forest protection. He will explain more about Greenpeace’s campaign for the Amazon, its current progress, and there will be space for questions. Date/Time: 25.2.26 - 18:00 Location: Lecture room - ZI - Česká zemědělská univerzita v Praze, Kamýcká 1176, 165 00 Praha-Suchdol Duration: \~1.5-3 hours Free and open to all; family-friendly

This time we are going to experience the world-famous spa town of Karlovy Vary, a spa town situated in western Bohemia. We will admire the grand 19th-century spa architecture, stroll along the impressive colonnades, and sip the presumably health-restoring sulphurous waters from 12 different springs in spouted ceramic drinking cups. One of the most famous attractions is the hot spring that spews out hot thermal waters to a height of 12 meters. Distance : 10 km (about 5 hours) Difficulty Rating : Easy Tour Highlights: • Professional and friendly guide • Transportation by air-conditioned bus • Visit the Mill & Market Colonnade • Entrance to the Church of St. Mary Magdalene • Visit and tour the Vrídelní Kolonáda underground spa’s inner workings) • Entrance to the Diana tower lookout • Entrance to St. Peter and Paul Cathedral • Visit the Japanese Garden • Moser glassworks tour OPTIONAL • Entrance to Jan Becher Museum (includes tasting of 4 different types of Becherovka) • Thun Porcelain Shop More information at : https://www.facebook.com/events/1425899982330883/

🎤🔥 OPEN MIC \| JAM SESSION @ Tequila Tales 🔥🎶 Ready to step on stage, grab the mic, and let your talent shine? ✨ We’re launching a weekly Open Mic \| Jam Session — a vibrant\, inclusive space where artists come together to create\, experiment\, and perform in front of an energetic\, supportive crowd 🎭💛 📅 Every Wednesday 🚀 First Edition: Wednesday, 21st January 2026 🎭 Who can perform? 🎤 Poets & spoken word artists 😂 Stand-up comedians 🎸 Musicians & bands 🎭 Improv & theatre performers 🪄 Magicians & experimental acts ⏱ Performance slots: 15–20 minutes 🎶 Open format \| Free entry \| Community vibes only 📝 Want to perform? Sign up here: 👉 https://forms.gle/uwcZcDdGkBwM3Yqs9 ⏰ Signup deadline: Sunday 19:00 (same week) 📋 Final roster announced: Monday ⚠️ Late requests may be considered via WhatsApp on Monday & Tuesday only if slots are available — no guarantees once the lineup is full. Whether you’re testing new material, performing for the first time, or just soaking in the creative energy — this stage is yours 🎶🔥 Come perform, come support, come vibe ✨🍹 🎤💥 Every Wednesday. One mic. Endless talent. 💥🎤

Filozofování o životě a o všem ostatním pro všechny, bez vstupného a bez přihlášky: Co si přejete, s čím si lámete hlavu, co Vás nenechá spát, o čem dumáte, o čem sníte, co Vám vrtá hlavou, čeho se bojíte, na co vzpomínáte, o čem přemýšlíte? Nenechte tyto věci jen pro sebe, zkuste rozhovor s jinými lidmi. U nás nejde jen o to, si popovídat, o to taky, ale to máte i jinde. U našeho stolu se pokusíme, spolu *filozofovat*. Nejdříve se dohodneme, jaké téma budeme diskutovat, a pak se do toho pustíme, budeme přemýšlet, rozmýšlet, promýšlet a zamýšlet se, až se nám z toho bude točit hlava, přitom nám budou podporou filozofové všech věků, abychom jí neztratili, tu hlavu. Ani byste nevěřili, jak filozofie může být osvěžující…

Bitcoin Knots a podobné implementace se snaží vynucovat content policy na úrovni mempoolu a odmítají transakce považované za nežádoucí (označované za spam). Lukáš, náš expert na Rust a bitcoin, vám osvětlí tento problém v teorii i v praxi. **🦀 18:00 - 19:00: PREZENTACE** Tato přednáška vysvětluje, proč je filtrování transakcí na základě obsahu neúčinné v jakékoli vrstvě bitcoinového protokolového stacku. Představí dva vzájemně se doplňující argumenty. 1. Z pohledu topologie sítě: v gossip síti, kde i malá menšina uzlů zůstává permisivní, transakce s vysokou pravděpodobností obejdou filtrované uzly. 2. Z pohledu informační teorie: každý protokol, který je dostatečně expresivní, aby byl užitečný, nutně umožňuje steganografické kódování. Prostor platných transakcí je natolik velký, že do něj lze vložit libovolná data způsobem nerozlišitelným od běžné ekonomické aktivity. Filtrování na základě obsahu tak čelí protivníkovi s větším počtem stupňů volnosti než má samotný filtr. **🦀 19:00 - 19:30: LIVE DEMO + Q&A** Součástí prezentace bude živá ukázka agresivního relay uzlu napsaného v Rustu, běžícího na mainnetu, která v reálném čase ukáže tok transakcí napříč různými implementacemi uzlů. **🦀 19:30** **\- 22:00: NETWORKING** Po přibližně 60minutové prezentaci a Q&A zůstáváme na networking u piva, zhruba do 22:00. * **Vstup s registrací zdarma.** * **Pivo zdarma** pro prvních 50 hostů. * **Odměny** za nejlepší otázky. * **Knihy** od Braiins **zdarma**. **🦀 PŘEDNÁŠEJÍCÍ** Lukáš Hozda je expert na Rust, autor knihy Building Bitcoin in Rust a lektor Rust kurzů na Univerzitě Karlově. Přes den pracuje v pražské bitcoinové softwarové společnosti Braiins, kde jeho oficiální pracovní titul zní Braiins Superman. * Stáhněte si jeho eBook [Building Bitcoin in Rust zdarma](https://braiins.com/books/building-bitcoin-in-rust). * Sledujte Lukáše na X: [https://x.com/LukasHozda](https://x.com/LukasHozda) Pokud vás zajímá seriózní Rust engineering, přidejte se k nám. 🔗 https://braiins.com

This is an informal event for English speaking teachers. We network, build relationships and exchange ideas. If you’re facing any challenges, than feel free to talk about it with the group. I ask for 30 crowns to cover the cost of monthly meet-up groups. I look forward to seeing old friends and making new ones. See you soon Aaron

Ahoj Péhapkáři! Zveme vás na další sraz komunity. 17:30 – open doors 18:00 – přednášky 20:00 - kvíz & networking Program: 🎤 David Chodúr - Využijte "skills" s AI agenty pro PHP 🎤 Jirka Pudil - Novinky v PHP 8.5 🎤 Milan Šulc - AI v OSS: Jak jsem naboostoval vývoj oss knihoven s AI tooly \-\-\-\- Děkujeme našim partnerům a těšíme se na viděnou! Adresa: Alma Career - Dock in Five, Menclova 2538/2, Libeň \-\-\-

This group is for anyone who writes - for any reason. Have a thesis or article you need to write? Trying to finish a novel or an academic paper? This group is for you. We are currently meeting in-person at Locus Workspace. If you have any questions, contact Sonya Lano here or on Facebook or Messenger (https://www.facebook.com/sonya.lano). We start at 9:00, introduce ourselves, and share a few words about what we're working on and what we hope to accomplish during the session. At the end of the session, you can give us a brief recap of how it went. We'll break at noon. The afternoon session starts at 2:00 pm. You're welcome to join both sessions or just one. Please come as close to 9:00 as you can if you come for the morning session. If you come to the afternoon session, we are usually back by about a quarter to 2:00.

**⚠️** You must register for the event on [Luma](https://luma.com/6lta7zul?utm_source=meetup) **⚠️** **Come have a cozy chat about Kotlin!** ​​ ​​Join us for a casual evening of conversation with fellow Kotlin enthusiasts. ​​ ​​**What to expect:** A relaxed atmosphere where you can share your use cases and real-life scenarios, or learn what others are working on. No presentations, no formal agenda—just great conversations. ​​ ​​**Who's invited:** All Kotlin enthusiasts! Any experience level, any use case, any background. ​​ *Hosted by Yasan Ghaffarian (Senior Mobile Engineer)*

Hi All, Come and join the yearly tradition of the pancake run! We will meet at Metro station Malostranska (outside, next to Euro Hotdog), and from there run along the river, through Vysehrad and will end up in Vrsovice, close to tram stop Kubanske Namesti. There will be coffee and pancakes for all who arrive. The run will be around 10 km, with two uphill parts.

We will have our certified mediums available and you can receive 3 10-minute readings for $20. To keep you safe, we will be following all CDC and Health Dept. guidelines at our psychic fair today. Sitters and readers required to wear a mask. We will maintain a minimum of 6 foot physical distance during readings. Please, if you can, bring your own portable chair to use during your readings. Please note that we are at our wonderful new home at Unity of Columbus, 4211 Maize Road, Columbus, OH

We will show a variety of methods for building agents that run in Microsoft Foundry. This covers the different types of agents: Prompt, Multi, and Hosted, as well as the development lifecycle using evals and traces.

Welcome to Casual Boardgames, where we enjoy classic tabletop games and social deduction games while bonding over good food, drinks, and great conversations. 
We started this group to meet new people and make new friends, and bonding over games in a relaxed atmosphere is a great way to do that. We currently meet near route 23 and Polaris Parkway, and this is close to areas like Powell, Lewis Center, Worthington, and parts of Westerville and Columbus. 
Feel free to bring your own games or play one of the many games our members bring. If you are inexperienced, we will help you learn. 
Here are just a few examples of the kind of games we play. 
Tabletop/board games: Splendor, Catan, Azul, Dominion, 7 Wonders… 
Social deduction games: Code Names, Chameleon, Werewords… 
IMPORTANT: 
1. While we love playing a variety of games and competing, we are not just about the games. We interact and talk while playing, and this leads to a lot of laughter and fun. If you just want to compete and focus solely on the game, then this is probably not the group you are looking for. 
2. Many people join groups like this and never (or rarely) show up after weeks or months. If you join and never really come, we will eventually remove you from the group as a courtesy to our members. Why? Because limiting group conversations (on the app) to regular members makes communication and planning much easier. Also, while it may be rare, it protects members from people who join because they are interested in following a person instead of having a real interest in our group. If you get removed, it is just because you haven’t come, and we follow this protocol as a courtesy to our regular game players.

**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** *Spec-Driven Development with GitHub Spec-Kit: From Intent to Implementation* Spec-driven development flips the traditional workflow on its head: instead of code being the source of truth, the specification becomes the backbone of design, collaboration, and delivery. In this session, we’ll explore how GitHub Spec-Kit enables teams to treat specifications as first-class artifacts—living documents that drive architecture, implementation, and verification. You’ll learn how Spec-Kit helps teams clearly express intent using structured, version-controlled specs that live alongside code. We’ll walk through a practical workflow that starts with defining system behavior and constraints, then progressively refines those specs into testable, automatable outcomes. Along the way, we’ll show how specs can reduce ambiguity, improve cross-functional collaboration, and make design decisions explicit before a single line of production code is written. This talk will cover: --What spec-driven development is (and what it isn’t) --How GitHub Spec-Kit fits into modern developer workflows --Using specs to align product, engineering, and AI-assisted development --Real-world examples of turning specs into implementations with confidence Whether you’re building greenfield systems, integrating AI into your stack, or trying to reduce costly rework, spec-driven development offers a scalable way to move faster without sacrificing clarity. Attendees will leave with concrete patterns and a clear mental model for adopting GitHub Spec-Kit in their own projects. **YouTube Link** TBA

Rev. Steven Clevenger is an ordained spiritualist minister with over 40 years experience as a Spiritual Healer, Clairvoyant and Spiritual Teacher, educated and trained at the White Lily Chapel. Rev. Siobhan Wolf Shaffer is an ordained spiritualist minister and certified medium and healer with over 20 years experience. She began her development in 1988 in Pennsylvania and continued when she moved to Ohio in 1998 where she studied at Rays of Lights Church with Rev. Steven Clevenger. Our full worship services consist of an inspirational lecture, healing meditation, and messages from the spirit world that serve to demonstrate evidence of eternal life. Please visit our Official Church Website (http://raysoflightchurch.com) for more information.

**New Dojo Location!** **Draft Day Columbus** 1130 Dublin Road Columbus, OH 43215 We're going to try a new dojo location for a few weeks and see how it works Dojos are informal Python group study sessions where everyone interested in Python gathers to learn about Python, help others with Python, or just hang out. Everyone is welcome from Python beginners to experts. Bringing a laptop is encouraged (we'll have extension cords and power strips). If there's something you want to learn leave a comment on this invite so we can plan ahead. We're looking for topic suggestions and people interested in presenting at our monthly meetings. To this end we've set up a survey form at [https://docs.google.com/forms/d/15eBKF1nQQ2XS5gzD4rvhVRHMBEj7lJtHuA9wXupS3Uc](https://docs.google.com/forms/d/15eBKF1nQQ2XS5gzD4rvhVRHMBEj7lJtHuA9wXupS3Uc)

Come chat about Atlassian tools and best practices at the Reynoldsburg Sunny Street Cafe and Breakfast is on Atlassian! Let's get the day started off with breakfast with your ACE Leaders! We're always excited to talk about Atlassian Products, share our knowledge and hand out swag! Come chat with us about new product news and anything you are working on within the Atlassian product stack. This is a great opportunity to come see what we are all about, hear new business news and share with other Atlassian users your questions and experiences. We'd love to see new and old friends come out to chat and learn about Atlassian! Agenda --- Moderators Kimberly Deal - Columbus Atlassian User Group Leader Kevin Stanley - Columbus Atlassian User Group Leader Greg Sprowls - Columbus Atlassian Community Leader Hosted By Kimberly Deal, Atlassian User Group Leader Kevin Stanley, Chief Everything Greg Sprowls, Agility Lead --- Global Partner Atlassian (http://atlassian.com) Millions of users globally rely on Atlassian products every day for improving software development, project management, collaboration, and code quality. Partner Atlassian --- For over a decade, Atlassian customers have come together to network, share ideas, solve problems, and find new ways to use Atlassian products. Today, more than 15,000 people take part in Atlassian community events in more than 30 countries. --- Complete your event RSVP here: https://ace.atlassian.com/events/details/atlassian-columbus-presents-rise-and-shine-with-atlassian-reynoldsburg-4/.