Decentralized Systems & Applications

Two hour activity session for children aged 6-11 **£30 CASH PER CHILD** - **payable on the door.** BITCOIN DISCOUNT [HERE ](https://btcpay.btc.aw/apps/rvvVwGSSSiJ7UgtzjmBdxy1Uq6a/pos) Come along to Cyphermunk House for a special holiday session for CYPHERTOTS to get interactive with Bitcoin fundamentals like proof of work and the timechain through real world activites and games. For ages 6-11. All welcome.

**A software engineers guide to LLMs** In this talk Richard Conway will break down what LLMs are layer by layer, how they work, how they use software principles to work and how to use them in software. This will be a fluid talk with a lot of philosophy, maths from school and how to build your software understanding things like hallucinations and new techniques that can make your management of LLMs more deterministic. We'll consider a lot of things here including the new code generation tools which have developers quivering in their boots, what they mean for our industry and how to use them for effect. Lots of mini-demos and great discussions, good people, beer and pizza! **About the speaker** Richard Conway co-founded the user group, along with Andy Cross, Joe Hancock and Chris Parsons. He is a Microsoft AI MVP and a Microsoft Regional Director and has been writing software in one form or another since his fingers were large enough to hit a ZX81 keyboard.

🎤 **Join Our Free Public Speaking Class in Central London** * 🌟 Are you struggling with public speaking or experiencing anxiety about it? * 👉 Attend our in-person public speaking class, suitable for beginners to advanced speakers, absolutely FREE as a guest! *You don't need to speak - just observe and learn, or participate if you feel ready.* **Why Attend Our Public Speaking Class?** * 💪 **Overcome Public Speaking Fear** Central London Toastmasters is the premier weekly public speaking club, offering a relaxed and supportive environment. Practice in a safe space where no one judges you, and start your journey to becoming a confident speaker. * ✨ **Become a Charismatic Speaker** Enhance your public speaking skills and develop the charisma you've always wanted. Impress your colleagues with smooth, polished presentations and wow your friends with newfound confidence and storytelling abilities. * 💼 **Improve Business Speaking Skills** Our meetings are friendly and informal, making them the perfect starting point for building confidence in public speaking. Many of our members began with anxiety, but now speak with total confidence. As a guest, you’ll see firsthand how warm and welcoming our club is, and you can chat with members about their experiences. * 🏆 **Develop Leadership Skills** Public speaking is not just about presenting; it's also about leading. Our club provides opportunities to take on leadership roles, helping you to develop crucial skills like team management, decision-making, and strategic thinking that can benefit your personal and professional life. 📅 **Location and Time** * 📍 Location: Cittie of Yorke pub, Holborn * ⏰ Time: 6:30 PM – 8:30 PM (Feel free to arrive late and quietly take a seat) 🔄 **What to Expect at Our Meetings** * The meeting is divided into two halves, each lasting approximately 50 minutes, with a 10-minute break. * 🎯 First Half: Members participate in impromptu speeches, and guests are invited to introduce themselves by name. * 📈 Second Half: Members deliver prepared speeches followed by evaluations. * After the meeting, we enjoy drinks and informal chats, providing a great opportunity to network and learn more about the club. 🎟️ **Interested in Becoming a Member?** Membership includes access to our online course, Pathways, guiding you step-by-step through your public speaking journey. A full year’s membership, covering 50 weekly meetings, is just £168, plus a one-time £30 registration fee. **💬 Testimonials from Our Members** * **“Toastmasters transformed my life!”** "I went from fearing public speaking to leading meetings at work. This newfound confidence even earned me a promotion!" – **Alexander** * **"A warm and supportive club!"** "From the first meeting, I felt welcomed. The constructive feedback boosted my confidence both in public speaking and daily life." – **Sarah** * **"Overcoming my fear was easier than I thought."** "The support here made my sales presentations more impactful and less stressful. It's been a game-changer for me professionally." – **David** * **"A fun and rewarding experience."** "I look forward to every meeting. The sessions are engaging, and I love the socializing afterward." – **Lucy** * **"I've grown as a speaker and leader."** "Taking on roles in the club has sharpened my leadership skills, making me more effective at work." – **James**

Registration Portal: [Event Registration Portal](https://luma.com/cclondon26?utm_source=sherif) About Event ​"Why are there no coffeeshops open late? But what if I want to co-work at night?!?" - everyone on Twitter ​Cerebras is excited to present, Cafe Compute. The first, late-night pop-up coffeeshop with a barista bar ☕️, cozy snacks and couches 🛋️, and more. ​​​​​​This event is brought to you in collaboration with OpenAI. ​​Cerebras is the world’s fastest AI inference, up to 15x faster than leading GPUs. Cerebras Inference is powered by our Wafer-Scale Engine (WSE-3) - the world's largest AI chip. Experience the speed for yourself with OpenAI Codex-Spark, powered on Cerebras, and get free compute at cerebras.ai. Location Please register to see the exact location of this event.

***The Fitzroy Tavern Edition*** ALTERNATIVE PLATFORM FOR BOOKINGS: **EVENTBRITE** (link below) Start your public speaking journey with us. Like a lot of people, we’ve had our own battles with public speaking. That’s exactly why this group exists. It’s for anyone who wants a place to start, people who want to keep practising, and those who just need a friendly audience to try things out. We grow at our own pace and build confidence in a relaxed, safe and supportive space. You’ll meet like-minded people, make new connections, and steadily get more comfortable speaking in front of others. There’s no judgement here. It’s just space for people to be themselves. We know there’s no single “right” way to speak in public. Whether you’re prepping for presentations, interviews, a best man speech, handling social situations, or simply getting more comfortable saying what you think, you’re welcome to explore your own style and find what feels natural to you here. PS Free event. Groups are kept small so everyone gets plenty of stage time, usually no more than 10–15 people. The pub kindly lets us use their space, so if you fancy it, feel free to grab a drink (or just a soft drink ) while you’re here. It’s a nice way to say thanks and helps us keep the space for future sessions. Eventbrite link: https://www.eventbrite.com/e/public-speaking-with-authenticity-reps-not-rules-tickets-1980278600602?utm_experiment=test_share_listing&aff=ebdsshios&sg=44d6d68e9a6562610839867fc9177e5b1d319685453f7cbd5502deb615049586b7e092be26e1ecfe0679502e35d905a0559ee449358ed8b5a17242d1abf6a83846e04015227bdfed111e8f519a62

**Venue:** Riverbank House, 2 Swan Ln, London EC4R 3AD **Please note:** 1\. 🚨🚨🚨 A valid photo ID is required by building security\. 🚨🚨🚨 2\. This event follows the [NumFOCUS Code of Conduct](https://numfocus.org/code-of-conduct). Please familiarise yourself with it before attending. If your RSVP status says "You're going" you will be able to get in. No need to show your RSVP confirmation when signing in. If you can no longer make it, please unRSVP as soon as possible. **Code of Conduct:** This event follows the NumFOCUS Code of Conduct. Please get in touch with the organisers with any questions or concerns. As always, there will be free food and drinks, generously provided by our host, Man Group. **Main Talks** 1. **[Nicoleta Lazar](https://www.linkedin.com/in/nicoleta-lazar-921a6864/) Query federation in modern OLAP databases** As analytics ecosystems grow more diverse, organisations increasingly need to query data across warehouses, data lakes, and operational systems without excessive data movement or duplication. **Query federation** has become essential by enabling unified SQL access and intelligent predicate pushdown into heterogeneous sources. This talk introduces the core principles of federation and why it matters for modern OLAP workloads. Using StarRocks as a model system, we highlight its vectorised execution engine, native connectors, and deep Apache Iceberg integration that together deliver high-performance lakehouse querying. 2. [Ben Guerin](https://www.linkedin.com/in/bjhguerin/) **How I Learned to Stop Worrying and Let Claude Code Write the Python [the story of [ismypubfucked.com](http://ismypubfucked.com/ "http://ismypubfucked.com")]** 43,000 pubs. Official VOA data. One question. [ismypubfucked.com](http://ismypubfucked.com/ "http://ismypubfucked.com") got 400k visits in two weeks and wall-to-wall media coverage: from the Mirror to the Telegraph to City AM. I'm not a Python developer. I used Claude Code to wrangle government spreadsheets, match them to OpenStreetMap, and ship a working site. All in less than 6 hours from initial idea to a live website. The AI wrote the Python, I just knew what story the data could tell. This talk covers what happens when tools like Claude Code unlock Python for people who think in narratives rather than syntax, and what a decade of building viral campaigns has taught me about making people actually give a shit about spreadsheets. **Lightning Talks** 1. **TBC** 2. **TBC** \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- **Logistics** Doors open at **6.30 pm** (get there early as you'll need to sign in with building security). Talks start at **7:00 pm**, with drinks afterwards from **9:00 pm** at The Banker (EC4). We have reduced capacity for this event, but there will be plenty of people to discuss data science questions with. Please unRSVP in good time if you realise you can't make it. We're limited by building security on the number of attendees, so please free up your place for your fellow community members. If you want me to trim lightning talks down to two or shorten any abstracts, say which ones.

Vibe Coding Collective is teaming up with **ElevenLabs** to push the boundaries of sound-first vibe coded apps. For one night, we’re getting full access to their tech to explore what’s possible when vibe coding meets voice and music generation. Whether you want to build a voice-controlled game, an AI storyteller, or a children’s app, this is your playground. Use any tools you like (Lovable, Google AI Studio, v0, Cursor, Replit…) and plug in ElevenLabs' power. 🍻 **Format 🛠️** We’ll be teaming up in small groups (2–3 people). We'll provide a specific "Voice & Vibe" challenge, then it’s heads-down building. The goal is to **vibe, experiment with sound, and see how voice and music changes the way we interact with vibe coding**. ## New to vibe coding or voice tech? ✨ No worries! We’ll provide a special **ElevenLabs Starter Kit** with API recipes and prompt examples so even total beginners can get an AI talking in minutes. ## Schedule 🕒 *(Aim to arrive by 6:50 PM so we can get your API access sorted!)* * 7:00 – ElevenLabs Presentation & Tech Demo * 7:20 – The Challenge + Team Formation 🤝 * 7:30 – Round 1: Build & Hear 💻 * 8:15 – Break (Grab a drink, hear what others are cooking) 🍺 * 8:30 – Round 2: Polish & Play 🏗️ * 9:00 – The "Vibe Check" Demos 📺 (Show/Hear what you built!) * 9:20 – Hang out, network, make friends ✌️ ## Who is it for? Anyone! Curious coders, GameDevs, artists, musicians, sound designers, voice actors, entrepreneurs. If you’ve ever wanted to talk to your computer (and have it talk back), you belong here. ## What to bring: * Laptop! 💻 * Headphones (Essential for testing those voice vibes!) 🎧 * Vibes ⚡ ## Location 📍 London College of Political Technology Newspeak House 133-135 Bethnal Green Road London E2 7DG 👉 No gatekeeping. No silence (this time). Just new voices and friends! Disclaimer: By signing up, you consent to the collection and sharing of your name, email address, photos, videos, and software, unless you explicitly opt out by informing the organizers.

High tech discussions at the edge of Bitcoin innovation **[TICKETS HERE](https://btcpay.btc.aw/apps/rvvVwGSSSiJ7UgtzjmBdxy1Uq6a/pos "https://btcpay.btc.aw/apps/rvvVwGSSSiJ7UgtzjmBdxy1Uq6a/pos")** Antoine Riard discusses Ark. Technical knowledge advised, all levels welcome. Promotional activities related to shitcoins not permitted. No unsolicited photograhy. Peace and love.

Elixir London Meetup; February 2026 edition. All are welcome. **Session 1: Anton Borisov - Distilling Kafka's Binary Protocol into Elixir** We'll trace a produce request to show what any Kafka client has to get right. In the BEAM ecosystem, erlkaf wraps librdkafka, brod implements the protocol in Erlang, and [kafka_ex](https://hex.pm/packages/kafka_ex) goes pure Elixir. Kafka_ex's approach is to generate serializers at compile time from Kafka's own schema definitions: plain structs, pattern matching, structural boilerplate isolated from the logic you actually think about. That design is what let us jump two major versions ahead and adapt to significant protocol changes. Let's dig into the idea, the code, and the tradeoffs. **Session 2: Evadne Wu** **\- JavaScript Execution Strategies in Elixir\-based Agent Frameworks** We'll look at integration points between elixir agents (in the AI fashion) and JavaScript execution, and all the foot guns involved. *The event is kindly sponsored by* [Fresha](https://www.fresha.com). **Time** Doors open at 18, start at 18.30. **Venue** Fresha The Bower, 207-211, Old St, Tower, London EC1V 9NR **Refreshments** Food and drinks will be provisioned on the day. **IMPORTANT**: **If you wish to take photos and post online during the event, please notify organisers first, so that attendees can opt-out from being in photos.**

Agents are writing code, running workflows, and building other agents. ​ The challenge isn’t basic functionality. It’s getting these systems to operate predictably in production, and integrating them into how teams build and ship software. ​This session covers both. ​ From a production lens: how to build agentic systems using spec-driven development, structured context, and evaluation loops that hold up at scale. ​From a human lens: what breaks when agents become collaborators. Ownership, coordination, and how teams actually adapt. ​Speakers: ​**Clifton Cunningham** ​**Member of Technical Staff, [guidemode.dev](https://guidemode.dev/?utm_source=luma) \| Former CTO at DailyMail\, Infinitas Learning\, TES Global** ​Clifton will explore what happens when AI agents become part of your team. Drawing on experience leading large-scale engineering organisations, he’ll unpack the human, cultural, and operational challenges of working alongside AI colleagues. ​**Alfonso Graziano** ​**AI Tech Lead\, Nearform \| Author of *AI-Native Software Engineering*** ​Alfonso will walk through how to build agents that build and maintain other agents. A practical, production-focused session covering spec-driven development, context engineering, evaluation loops, and how to make agentic systems reliable at scale. ​ Join us for pizza, drinks, and practical AI insights.

**Important:** Register on the [event website](https://www.aicamp.ai/event/eventdetails/W2026040809) is required for admission. **RSVP on meetup is turned off** Enjoy afterwork drinks and practical discussions on Apache Kafka, ClickHouse, PostgreSQL and much more. Enjoy a session designed for data engineers, architects and technical decisions-makers like you, who want to address the challenges they face in data-infrastructure. No high-level pitches but straight into practical discussions on how to build scalable, efficient open sourced-powered data platforms. **Why Attend?** * Connect with local data and tech professionals * Get practical insights into streaming, storage, and analytics with Kafka, Iceberg, PostgreSQL, and ClickHouse * Learn how to reduce operational overhead while scaling your data infrastructure performance * Bring your questions and challenges for direct discussions with Aiven experts **Agenda:** * 4:00pm\~4:30pm: Checkin, Food, Networking * 4:30pm\~6:00pm: Tech talks and Q&A * 6:00pm\~7:00pm: Happy hour, Open discussion, Networking * **Tech Talk: Context Is the New Infrastructure** **Speaker:** Stan Dmitriev (Aiven) **Tech Talk: Apache Kafka on Aiven** **Speaker:** Hugh Evans (Aiven)

Antoine Riard is, among other things, a contributor to both Bitcoin Core and the Lightning Network. In this event, he will share his expertise and knowledge about Ark: a technology that aims to help address some of Bitcoin's known limitations at scale. He will share its benefits, tradeoffs and his opinions. Don't miss this event, hosted at Cyphermunk House! Location: **9 John Street, Holborn, London, WC1N 2ES** Date: Wednesday 8th April 2026 Time: 18:30 Find more info and purchase a ticket (first timers are free) here: https://www.cyphermunkhouse.com/events

**Join us for a joint meetup with our friends from Qodo and Tessl** AI coding agents are increasingly embedded in production workflows, but their failure modes are often poorly understood, difficult to detect, and even harder to evaluate systematically. ​This session examines how agent-based systems degrade under real-world conditions, focusing on three critical dimensions: reliability, code quality, and security. We’ll look at where current evaluation approaches fall short, how non-determinism and context drift impact correctness, and why seemingly “successful” generations can still introduce latent defects or vulnerabilities. ​If you’re building, evaluating, or deploying AI agents in production systems, this session will provide a grounded view of where they fail and what it takes to make them robust **Agenda** * ​​​6:00pm Venue opens * ​Join us for Drinks and Pizza! * ​​​6:30pm **Hidden Failure Modes for AI Agents** by Nupur Sharma * ​6:50pm Panel Discussion * ​**Panelists** * ​**Simon Maple -** Developer Relations at Tessl * ​**Brian Vermeer** \- Staff Developer Advocate at Snyk * ​**Nupur Sharma -** Solutions Engineer at Qodo * ​**Kunal Kushwaha -** Senior Developer Advocate EMEA at Cast AI **SPEAKERS** **​** **Simon Maple - Developer Relations at Tessl** ​Simon Maple is the Head of Developer Relations at Tessl, and AI Native Dev co-host. Previously, Simon was the Field CTO, and VP Developer Relations at Snyk, ZeroTurnaround, and IBM. He became a Java Champion in 2014, JavaOne Rockstar speaker in 2014 and 2017, Duke’s Choice award winner, Virtual JUG founder and organiser, and London Java Community co-leader ​ ​**Brian Vermeer** \- Staff Developer Advocate at Snyk ​Staff Developer Advocate for Snyk, Java Champion, and Software Engineer with over a decade of hands-on experience in creating and maintaining software. He is passionate about Java, (Pure) Functional Programming and Cybersecurity. Brian is a JUG leader for the Virtual JUG and the NLJUG. He also co-leads the DevSecCon community and is a community manager for Foojay. He is a regular international speaker on mostly Java-related conferences like JavaOne, Devnexus, Devoxx, Jfokus, JavaZone and many more. Besides all that, Brian is a military reserve for the Royal Netherlands Air Force and a Taekwondo Master / Teacher. ​ ​**Nupur Sharma -** Solutions Engineer at Qodo ​ ​**Kunal Kushwaha -** Senior Developer Advocate EMEA at Cast AI ***

Join the CONNECTED Westerville Mastermind Group for a dynamic afternoon of B2B networking! This event is perfect for professionals looking to expand their business connections, share insights, and foster collaboration within the community. Whether you are a seasoned entrepreneur or just starting out, this event offers a valuable opportunity to exchange ideas, build relationships, and grow your network in a supportive environment. Connect with like-minded individuals, explore potential partnerships, and discover new opportunities for professional growth. Don't miss out on this chance to enhance your business network and take your career to the next level with CONNECTED Westerville Mastermind Group! We meet the 4th Monday of every month from 11am-1pm. Welcome and general networking from 11am - 11:30am with core meeting 11;30 - 12:30 and a final round of networking from 12:30 - 1pm.

## **Columbus Bitcoin Meetup – Event** Join us for another great evening dedicated to Bitcoin, learning, and community. We will be gathering in the private room at Olentangy Brewery for an evening of conversation, education, and fellowship with fellow Bitcoiners. This special event will feature three guest speakers sharing insights from across the Bitcoin ecosystem. ### **Guest Speakers** **Lindsay Faust** Relationship Manager at River **Andrew Tilmann** CEO of the Midwest Bitcoin Summit **Carlos Estrada** Founder of Coin Vigilante In addition to speaking during the event, Andrew Tilmann will also be available for a meet and greet. This will be a great opportunity to ask questions about the upcoming Midwest Bitcoin Summit, taking place September 23 and 24 at the Columbus Convention Center. ### **Midwest Bitcoin Summit Discount** Early Bird pricing ends **April 1st**, but you can still save **21%** by using the promo code: **COLUMBUS** Use the link below to apply the discount: [https://tickets.midwestbtc.com/affiliate/columbusbitcoinmeetup/event/midwest-bitcoin-summit-2026/?promoCodeTask=apply&promoCodeInput=columbus](https://tickets.midwestbtc.com/affiliate/columbusbitcoinmeetup/event/midwest-bitcoin-summit-2026/?promoCodeTask=apply&promoCodeInput=columbus) ### **Event Details** This will be a three hour event, with speakers beginning just before 7:00 PM. There will be plenty of time afterward for networking, meeting new friends, and continuing the conversation. Food will be provided. We look forward to seeing you there! ***

**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** GitHub Copilot is powerful, but what if you could scale from a solo AI assistant to an entire team of specialized agents working in parallel? This session introduces Squad: an open-source framework for multi-agent orchestration that lets you define teams of AI agents with specific roles, responsibilities, and expertise. We'll progress from Copilot basics to the Copilot CLI, explore how Agents add autonomy, and see how Instructions and Skills let you customize agent behavior. Then, the climax: a live demo where a Squad team of 3 agents (Lead, Developer, Tester) stands up and builds a working application in real-time, showcasing true multi-agent collaboration. Whether you're new to AI or exploring how to scale your use of Copilot, this session will show you what's possible when agents work as a team. **YouTube Link** TBD

AI is changing how art is made. But when does it stop being your work and start being the machine’s? This month we're going to be doing a panel with with digital image, music, and written word artists, talking about at what point, while using AI in the creation process, does the work become not the artist creation? We encourage audience participation during this event that will be moderated by Chris Slee. Whether you’re deep in the field or just getting curious, come connect with others building and exploring AI in Columbus. Sponsored by [Transform Labs](https://www.transformlabs.com/services)

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.

Central Ohio Radio Enthusiasts—CORE—is an informal community for anyone enthusiastic or curious about radio—whether you're new to radio and want to learn or you've been tinkering for years and want to share. Ham radio operators, GMRS users, Meshtastic fans, software-defined radio nerds, makers, and technical and non-technical folks are all welcome. No experience required or expected. This month we have **WiFi HaLow: Introduction and Practical Use** with **Alex Barbur**. Details are are [core.radio](https://core.radio).