Decentralized Systems & Applications

It's open gaming night again! Come alone (or with friends) and meet some new people to game with. Just look for the 'Open Gaming' table(s) and feel free to sit in. We'll keep the games pretty light, so if you don't know many games, don't feel intimidated. Instruction is always available. (70,- gaming fee still applies)

Looking to meet new people in Prague and play badminton in a relaxed atmosphere? Join our social badminton event – perfect for meeting people and having fun while playing. 🏸 All levels welcome 🏸 No experience needed 🏸 We mix players so everyone gets a game This is not a competitive tournament – the focus is on socializing and enjoying the game. 📍 Location: Badminton Aréna Skalka 🕒 Time: 20:00–23:00 💰 Price: 350 CZK / 250 CZK with Multisport Spots are limited. 👉 Reserve your spot here: [https://www.bananasport.cz/sportovni-udalost/14](https://www.bananasport.cz/sportovni-udalost/14)

**Greetings Sci-fi Enthusiasts in Prague!** Our June 2026 book pick is, *This Is How You Lose the Time War* by Amal El-Mohtar & Max Gladstone. Thank you to everyone that attended in May and voted on our book selection. Among the ashes of a dying world, an agent of the Commandant finds a letter. It reads: *Burn before reading.* Thus begins an unlikely correspondence between two rival agents hellbent on securing the best possible future for their warring factions. Now, what began as a taunt, a battlefield boast, grows into something more. Something epic. Something romantic. Something that could change the past and the future. Except the discovery of their bond would mean death for each of them. There's still a war going on, after all. And someone has to win that war. (description via Goodreads) Shout out to everyone that attended our book club in May and voted for our book selection. Thank you! Alejandra y Richard **Structure** * Book Club starts at 7:00pm and runs through 8:30pm. * Social time from 8:30 - 9:00pm. * No prep needed, just show up with an open mind and heart. * We gather up on the balcony level of the bookstore. * All are welcomed even if you haven't finished the book pick.

💪 Group Strength Training – All Fitness Levels Welcome Looking for a motivating workout without having to figure everything out on your own? Join us for a coached group strength training session where you'll improve your fitness, learn proper technique and train alongside other motivated people. Whether you're already active or just getting back into exercise, you're welcome to join. ✅ All fitness levels welcome ✅ Professional coaching ✅ Strength & conditioning training ✅ Friendly and supportive atmosphere ✅ Come solo or with friends Our coach will guide the session, adjust exercises when needed and make sure everyone gets a great workout regardless of experience level. The goal isn't competition. It's about moving, getting stronger and enjoying the process together. 💪 Build strength ⚡ Improve fitness 🤝 Train with great people Many participants join alone, making it a great way to stay active while meeting other motivated people around Prague. 📍 Sportovní areál Tenis Cibulka, V Stráni 485/11, Prague 5 Hosted by Mates 👋 ⚠️ Meetup RSVP alone does not reserve your spot. To secure your place, please register here: [https://www.bananasport.cz/sportovni-udalost/34#](https://www.bananasport.cz/sportovni-udalost/34#) See you at training!

Learning Czech can be hard and demotivating, especially when studying alone. **This meetup is a shared study session where we come together to stay focused, motivated, and make progress — each in our own way.** This is a co-learning / co-studying session, not a class. There is no teacher, no lesson, and no study material provided. Everyone comes with their own resources and studies independently, in a shared environment. 🧠 **How it works** • We all bring our own material: • textbooks • homework from a Czech course • Duolingo or other apps • reading practice • vocabulary review, etc. • We mainly work individually • We are free to: • ask questions • help each other • share tips and resources • No teacher, no formal structure, no pressure 👥 **Who is it for?** • Czech learners of all levels • Non-Czech speakers (expats, internationals) • Czech native speakers are welcome if they want to help, but this is not a language exchange ⏱ **Practical info** • Location: Cafedu 12, Škrétova 490, 120 00 Praha 2 (Metro A and C, Muzeum station) • Duration: 2 hours, or less or more, as you want • Day & time: Monday, 18:00 • Group size: small group for now • Free event — please support the café by ordering a drink ☕ If you’re learning Czech and lack motivation when studying alone, come join us — let’s find it together 🙂

**Looking for a fun way to meet new people in Prague?** Join us **every Monday** for our popular Karaoke & Beerpong Nights – a relaxed and international evening where Erasmus students, expats, and locals come together to unwind, sing their hearts out, and enjoy some friendly competition. We start at 21:00 and go till late! 🙏🏼 **💥 What’s Waiting for You** • 🎤 Karaoke – open mic all night long • 🏓 Free Beerpong – we’ll get you some free beer for the game 🍺 • 🎧 DJ playing international hits • 😌 Relaxed atmosphere – no pressure, just good vibes • 🌍 Meet internationals & Erasmus students from all over Whether you’re here to play, sing, or just vibe, it’s the perfect way to connect and kick back midweek. **👋 Who’s It For?** • Internationals, expats, & travellers • Anyone who enjoys karaoke, games, and social nights out **🎟️ How It Works** ✅ Entry is free – just come :) 🍻 Free beerpong (yes, we provide beer for the game) 💬 Solo or with friends – everyone’s welcome This event is co-organised with **Erasmus in Prague** 📸 Instagram: [@erasmusinprague](https://www.instagram.com/erasmusinprague?igsh=eXdkNWJvdXZuZXJt&utm_source=qr) 💬 Join our [International WhatsApp group](https://chat.whatsapp.com/FF9tF0cqyeJHkFd6krTczW?mode=ems_copy_h_t) 🔁 Recurring Weekly Event 😊 Same time, same place, every Monday 💙

**Looking for a fun way to meet new people in Prague?** Join us every Monday for our famous **Karaoke & Beerpong Mondays**– a relaxed and international evening where Erasmus students, expats, and locals come together to unwind, sing their hearts out, and enjoy some friendly competition. We start at 21:00 and go till late! (1-2am)🙏🏼 **💥 What’s Waiting for You** • 🎤 Karaoke – open mic all night long withh a DJ in between • 🏓 Free Beerpong – we’ll get you some free beer for the game 🍺 • 😌 Relaxed atmosphere – no pressure, just good vibes • 🌍 Meet internationals & Erasmus students from all over Whether you’re here to play, sing, or just vibe, it’s the perfect way to connect and kick back midweek. **👋 Who’s It For?** • Erasmus students • Internationals, expats, locals & travellers • Anyone who enjoys karaoke, games, and social nights out **🎟️ How It Works** ✅ Entry is free – just come :) 🍻 Free beerpong (yes, we provide beer for the game) 💬 Solo or with friends – everyone’s welcome **🔗 Stay connected** 📸 Instagram: [@erasmusinprague](https://www.instagram.com/erasmusinprague?igsh=eXdkNWJvdXZuZXJt&utm_source=qr) 💬 Join our [International WhatsApp group](https://chat.whatsapp.com/FF9tF0cqyeJHkFd6krTczW?mode=ems_copy_h_t) 🔁 Recurring Weekly Event Same time, same place – **every Monday** :) **Monday doesn't work?** You're in luck, we do the very same event **every Thursday in club FAMU**, among other meet-ups throughout the week! 😁

**Agenda:** * Introduction * Onsite/remote talk & Campfire * Lightning Talks / Fuck ups Open door @ 19:00 Prague time, start 19:30 Once a month on the last Tuesday, we bring together Web3 builders - tech. founders / smart contract programmers / auditors. Whether you are a Web2 developer interested to learn more or a senior in the Web3 sphere, our meetup is for you! Enjoy a nice cold lager and get ready to blow your mind on what’s possible in blockchain. Our upcoming meetup will be again hosted at Decada - a crypto-friendly cafe bar with an inviting atmosphere and friendly staff. Decada's commitment to innovation makes it the perfect venue for gathering like-minded people. They are happy to invite us to join them for an evening of fresh perspectives, vibrant discussions, and good company at Decada. Have something to share like a project or protocol in Web3? You get the floor for 5 minutes. Please signup here: [https://docs.google.com/document/d/1Dm3De2kWn00STS44Y0vyXtZsFd1A5TUU7sVH0aydr0s/edit](https://docs.google.com/document/d/1Dm3De2kWn00STS44Y0vyXtZsFd1A5TUU7sVH0aydr0s/edit) The meetup is focused on project conceptual design and smart contract development. Not frontends and JS Frameworks - there are other meetups for those. Example topics are inheritance approaches, comparison of proxies, their gas, size, ect. Other talks will be about cross chain / layer calls, blind signing, security, clever hacks, and more. Regarding contracts level - any smart contracts, i.e. not limited to EVM based. Have questions or want to share something cool with us? Join our community group on Telegram to get updates or to share knowledge: [https://t.me/+eA4eMYlEo-k2ZGVk](https://t.me/+eA4eMYlEo-k2ZGVk) We look forward to seeing you all!

The perfect code doesn't exi... by Martin Hořeňovský Perfect code doesn't exist, right? There are always tradeoffs, complications and hidden complexities in the way. At least until now. I wrote the perfect C++ function, and I'll show it to you. What's more, I'll prove it to you, using all the different automated tools and approaches we commonly rely on during development: compiler warnings, static analysis, code coverage and others. In practical terms, I will showcase various tools we use during development; what issues they can catch, what issues they do catch, and why they protect us from Murphy, but not Machiavelli. Timetable: 18:00 Get together, setup, socialize 18:30 talk starts ??:?? talk ends, more socializing For those who want to join online here is the **[ZOOM LINK](https://us06web.zoom.us/j/87626916146?pwd=tE0xBia9Mnd8t2IGshtNpwyekQ9Zle.1)** While you wait why not join our **[DISCORD SERVER](https://discord.gg/EPMXNGuHXG)**

**A vertical sandstone wall rising straight from the banks of the Elbe. Děčín Castle staring at you from across the river. 16 routes bolted into solid rock, ranging from first-timer-friendly to genuinely hard. And it's 90 minutes from Prague by train.** Pastýřská stěna — Shepherd's Wall — is the longest via ferrata in the Czech Republic and the only one located right in the middle of a city. You climb from the Elbe embankment to the top of a 150–170m sandstone cliff, with the river canyon and castle below you the entire way. It's the perfect introduction to via ferrata — or a great morning workout if you've done it before and want to push harder lines. What makes this place special is that you can do it multiple times in one day, on different routes. Beginners start on the easier B lines and get a feel for the gear. More experienced climbers go straight for the D routes and find they're harder than labelled. Everyone ends up at the same viewpoint on top, looking down at the same improbable view. **Who's this for?** Everyone. Literally. Kids from age 12, first-timers, experienced climbers — the wall has something for all of you. The only deal-breaker is a serious fear of heights. If you're on the fence about whether you can handle it: you can. Come and find out. *** **🗓️ The Day** 🚉 **08:00 — Meet at Praha hl.n. (main entrance)** We board the direct train to Děčín together. \~90 minutes, cheap ticket bookable on the **ČD app** (cd.cz). Hop on at any station along the Praha–Děčín line if that's easier. 🥾 **\~09:45 — Děčín hl.n. → Pastýřská stěna** 10-minute walk from the train station along the Elbe embankment to the base of the wall. You'll see it from the station — it's hard to miss. 🧗 **\~10:00 — Gear up & briefing** Rental at **Active Point Děčín** (\~150m from the wall, towards Tyršův most) — full set (harness, Y-lanyard, helmet, gloves) for **\~250 CZK/day**. No need to bring your own gear. We run a quick safety briefing for first-timers before anyone clips in. 🧗 **\~10:30 — Climbing** 16 routes, 150–170m each, grades B to E. We split into groups by experience and climb at our own pace. **Checkpoints at the top of each route** — we regroup, rest, and decide whether to go again or call it a day. ⚠️ **Important grade note:** The routes here are graded by the builder — and they run consistently harder than labelled. B feels like C, C feels like D. Come prepared for more than the grade suggests. 🍺 **\~13:00 — Lunch on the Elbe embankment** Cafés and restaurants right by the river. Sit in the sun, order something cold, and look up at what you just climbed. 🧗 **\~14:00 — Second round (optional)** Those who want more lines go back up. Those who are done explore the embankment or Děčín Castle nearby. 🚉 **\~16:00 — Firm meeting point at Děčín hl.n.** We catch the train back together. Back in Prague by \~17:30. *** **⛈️ Weather note** Climbing is strictly prohibited when it rains or the wall is wet — this is a safety rule, not a suggestion. We'll monitor the forecast in the WhatsApp group and confirm the day before. If conditions are bad, we reschedule. *** **🧗 Gear rental on-site** Everything you need is available at **Active Point Děčín**, \~150m from the wall: | Item | Cost | | ---- | ---- | | Full via ferrata set (harness, Y-lanyard, helmet) | \~250 CZK/day | | Gloves | Included or small extra | No need to bring your own kit. If you have your own gear, bring it — but it's not required. *** **🎒 What to bring** * Closed shoes with non-slip soles (trail runners are perfect, no sandals or hiking boots) * 1.5–2L water + snacks or cash for lunch * Light backpack you can climb with * Rain layer just in case * Cash for gear rental (card may not be accepted at the rental shop) **Dogs:** Not recommended on the wall itself · **Kids:** Suitable from age 12 with experience *** **💰 Cost (per person)** | Item | Cost | | ---- | ---- | | Train Praha ↔ Děčín (return) | \~150–200 CZK | | Gear rental | \~250 CZK | | Lunch | bring your own or \~200–300 CZK | | **Total** | **\~600–750 CZK (\~€25–30)** | This is completely **non-profit** — no fees, no markups. You only pay your own costs. *** **🚌 Option A — Train (recommended)** Praha hl.n. → Děčín hl.n., direct, \~90 min, hourly service. Cheapest and easiest — no parking, no driving, just get on the train. **🚗 Option B — Carpool** \~1.5h drive from Prague. Parking directly by the wall along the Elbe embankment (can get busy on summer weekends — arrive early). Coordinate in WhatsApp after RSVP. *** **RSVP here** and you'll be added to our WhatsApp group — that's where we share the exact train time, confirm the weather, and sort any last-minute details. See you at the wall. 🧗

**Anotace přednášky:** AI nástroje píšu kód rýchlejšie ako kedykoľvek predtým. No rýchlosť bez kontroly kvality je len technický dlh vo väčšom meradle. V tejto prednáške sa pozrieme na to, ako LLM skutočne fungujú, ako inteligentne pracovať s kontextom a ako z AI dostať konzistentný, kvalitný výstup. Ukážeme si, ako používať AI na písanie testov, a prečo je verifikácia kódu kľúčová pre tímy, ktoré sa na AI pri vývoji výrazne spoliehajú. **Čo si odnesieš:** * Pochopíš, ako LLM a AI agenti skutočne fungujú pod kapotou * Naučíš sa pracovať s kontextom tak, aby si z AI dostával lepšie výsledky * Zistíš, ako písať čisté testy pomocou AI * Pochopíš, prečo je verifikácia nevyhnutná, keď AI píše väčšinu kódu **O řečníkovi:** Filip Hric začal svoju kariéru tým, že zdieľal to, čo sa naučil o testovaní. A nejako sa to rozbehlo. Jeho blog prekročil 2 milióny prečítaní, jeho kurzy absolvovali tisíce vývojárov a testerov a stal sa jedným z mien, na ktoré sa ľudia v oblasti testingu a quality engineeringu odvolávajú. Dnes spolupracuje s vývojovými tímami na tom, ako zabudovať kvalitu priamo do ich procesu, vystupuje na konferenciách po celom svete a snaží sa, aby éra AI nebola strašiakom pre tých, ktorým záleží na softvéri, ktorý naozaj funguje. Žije na Slovensku so svojou ženou a štyrmi deťmi. Beháva a hrá na gitare. Těšíme se - organizátoři [Pro:]Test! **POZOR**! Meetup probíhá na adrese: **Lihovarská 1060/12, 190 00 Praha 9-Balabenka**, NE v sídle Accentura na Holešovicích. **Setkání probíhá osobně na místě bez streamování. Pořizovat budeme záznam, který následně zveřejníme na našem [YouTube](https://www.youtube.com/@profesionalni_testeri).**

Looking for an authentic way to experience Prague while meeting new people from around the world? Join us for a unique evening exploring **Czech beer culture** through some of Prague's most authentic pubs and breweries. This is not a pub crawl—it's a cultural experience where you'll discover local traditions, hear fascinating stories, taste great beer, and connect with fellow travelers, expats, and internationals. 🍺 Visit 5 authentic Czech pubs and breweries 📖 Learn Czech beer traditions and etiquette 🍻 Taste traditional and modern Czech beers 🥨 Czech beer snacks included 🏙️ Hear stories about Prague, brewing, and local culture 🌍 Meet international people and make new friends Whether you're new to Prague, visiting for the weekend, studying abroad, or have lived here for years, this experience offers a fun and relaxed way to discover one of the most important parts of Czech culture. 📅 Every Friday ⏰ 18:00 – 22:00 💰 890 CZK per person 👥 Maximum 10 participants for a more personal experience ⚠️ Minimum 4 participants required to run the tour What makes Czech beer culture so special? Come and find out while enjoying a memorable evening in great company. You can pay for the trip via: • Bank transfer: 7392420507/6363 • Revolut: @augustetqc 🍻 ***Real Beer. Real Stories. Real Prague.***

Join us for Symposium! 🌞🌻🌳 In antiquity, a symposium was a gathering of friends who came together to recline around a shared table, where wine and conversation flowed freely into the night. Together, they would choose a topic and take turns speaking, listening, and laughing—guided by the rhythms of drink and dialogue. Inspired by this tradition, our Symposium has no set theme. It's an invitation to come together with other curious minds, to offer up questions or ideas, and to vote together on where to begin. Whether you're hungry for connection or simply seeking space to speak and be heard, you're warmly welcomed to join the conversation. Symposium will meet in parks throughout Prague, embracing the sunshine and pleasant weather while we have it. Bring a blanket or something to sit on. There’s no cost to join, but please bring a snack or drink to share, if you're able. Most of all, bring a curious mind and a willingness to learn from the insight of others. Feel free to bring a friend or two--also, children and friendly dogs are welcome! \*\*\* If the weather doesn't cooperate, we'll try to find an alternate venue—so keep an eye on the event chat or your email for updates. Also, despite the origins of the Symposium, our goal is not necessarily to get drunk and the organizer would encourage you not to come with that sole purpose in mind. :) The first 45 minutes of the event will be dedicated to simply getting to know one another, and we highly encourage you to join for this part. We will then vote whether to continue free conversation, to join together in a single conversation, or to split up into multiple groups. Afterwards, you’re welcome to stay or follow onto any spontaneous activity that unfolds. A note on attendance: If you need to cancel, please do so at least a few days in advance and update your RSVP accordingly. This helps honor the host’s efforts and makes space for others who would like to attend. Repeated last-minute cancellations or no-shows may result in being placed on the waitlist for future events.

**Why are so many of us exhausted** — not from hardship, but from **the relentless pressure to do more, be more, optimize more?** Korean-German philosopher Byung-Chul Han has a diagnosis, and it might make you look at your own daily life differently. The Burnout Society is a short, sharp book that asks **why burnout, depression, and anxiety have become the characteristic experiences of our time — and whether the problem runs deeper than stress management or work-life balance.** Byung-Chul Han is a Korean-German philosopher based in Berlin who writes short, dense books diagnosing what’s gone wrong in contemporary life. He writes short, dense books — often under 100 pages — that draw on continental philosophy, cultural theory, and East Asian thought to diagnose something gone wrong in contemporary life. The Burnout Society, first published in German in 2010, was one of his early breakthroughs and one of his most widely read works. Join us for a close reading and open discussion. No prior knowledge of Han or continental philosophy is required. Participants are encouraged to read the text in advance and come prepared with a passage, a question, or a point of resistance. (I didn’t realize that the internet archive option is unavailable. If you can’t easily find a copy, please drop me a message here and I’ll help you out)

*Sorry for the 2 month break but I had to deal with some family member health issues, but we are now back!!* **LOCATION - THE DAILY GROWLER -** **2812 Fishinger Rd, Upper Arlington, OH 43221** Over the years, we’ve heard two requests constantly: 1. A place that was quieter and possibly private. 2. “I wish they accepted Bitcoin.” We’ve finally found a solution to these requests with The Daily Growler. We’ll have access to their private room, and you’ll be able to pay your tab with Bitcoin. Join us for a fun and relaxed social event! Enjoy delicious food and drinks as we chat about the latest news in the Bitcoin world. Everyone is welcome, whether you're looking for guidance, have questions, or just want to meet like-minded people. These social evenings are a great opportunity to make new friends and enhance your experience at the larger events throughout the year. We look forward to seeing you there! PSA: If the attendee RSVP seems low, keep in mind that most of our attendees come from X and not [meetup.com.](http://meetup.com./) You are welcome to come and become a part of our online community. Recordings of past guest speakers are available on our YouTube channel [https://www.youtube.com/@columbusbitcoin](https://www.youtube.com/@columbusbitcoin)

Want to be a speaker? submit your talk to our Call for Presenters!!! https://sessionize.com/azure-cbus-2026/

**Improving Office in Franklinton** Physical location: Improving Office 330 Rush Alley Suite #150 Columbus, OH 43215 Schedule: 6:00 p.m.: Socialize, eat, and drink. Improving will be providing pizza and beverages. 6:30 to 8:00 pm. Main meeting and presentation(s). Topic: This month Chris Pazsint will be talking about Agentic Coding. How does one use CLI Based Agents, and Agentic IDEs such as Cursor, Kiro, Antigravity? How to include agentic coding plugins for IDEs you already love such as Visual Studio Code. We meet on the last Monday of each Month. Presentations are given by members and friends of this group. If you would like to do a presentation (small or large) on a python topic, please contact Central OH Python at centralohpython@gmail.com

In this local meeting, you will discover knowledge that you can use to get over the past. The key to improving your personal motivation, self-confidence, and happiness is to get over your painful memories. When you become free of your past, you will be free from stress, anger, anxiety and depression. Studies show that negative emotions can affect your health. By being free of negative emotions, believe it or not, you will most likely even look younger, feel more energetic, and become healthier! Be sure to click on the red "Attend" button below to come to this local event. We look forward to seeing you there. This group is brought to you by the Dianetics and Scientology life improvement center.

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

Our monthly PHP meetup. A virtual shindig courtesy of Zoom. Check back here for the details around 6:15 pm