Open Source

Welcome to the PyData Berlin May meetup! We would like to welcome you all starting from 18:00. There will be food and drinks. The talks begin around 18.30 and the doors will close at 18:45. **Make sure to arrive on time!** Please provide your first and last name for the registration because this is required for the venue's entry policy. If you cannot attend, please cancel your spot so others are able to join as the space is limited. **Host**: **GetYourGuide** is excited to welcome you to this month's version of PyData. \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* The Lineup for the evening **Talk 1: Text2SQL in the Wild — Agentic Workflows & Semantic Models on Customer Data** **Abstract**: Translating a business user's natural language question into a reliable SQL query has huge value for business analysts, but doing it accurately at scale, on messy enterprise data, for complex queries, is incredibly difficult. This talk walks through a production Text2SQL system built on four pillars: semantic models built on customer data, RAG-based semantic search, an agentic verification and correction loop for building the SQL, and an evaluation framework for the entire process. Raw schema information is not enough for text2sql to work. Rather, thorough documentation including business metrics, synonyms, and qualified example queries, are required. We'll cover how to automate this documentation pipeline by mining query logs, generating descriptions with LLMs, and organizing everything into a knowledge graph and vector search index. From there, we'll dive into the agentic flow that takes a user question and iteratively generates, validates, and fixes SQL against a live database. The agentic framework analyses syntax errors and execution results to help it fix the SQL. Participants will leave with practical takeaways on RAG architecture for structured data, agentic retry patterns, and how to think about evaluation for Text2SQL systems in production. **Speaker**: Oren Matar **Bio**: Oren Matar is a principal data scientist and algorithms developer, with a background in social sciences and Bayesian methods. He specializes in NLP and time series forecasting, as well as agentic methods for data retrieval and processing. **Talk 2: Interpreting and Communicating Statistical Models** **Abstract**: Extracting actionable insights from complex statistical models remains a challenge, as raw coefficients are often uninterpretable due to nonlinearity, interactions, or hierarchical structures. This talk introduces a unified framework for model interpretation based on the principles of the Marginal Effects project ([https://marginaleffects.com/](https://marginaleffects.com/)). We move away from internal model parameters toward quantities of interest, such as marginal effects and adjusted predictions that translate statistical output into the "natural language" of the data. We will demonstrate these concepts in Python using the Bambi interpret module, showcasing a seamless workflow for interpreting Bayesian models built on PyMC. The audience will learn how to use the four primary interpretative pillars: Predictions, Comparisons, Slopes, and Marginal Means to compute average marginal effects and visualize conditional relationships. By the end of this session, you will be equipped to turn sophisticated GLMs and multi-level models into clear, rigorous narratives that are easily communicated to stakeholders. **Speaker**: Juan Orduz **Bio**: Juan is a Mathematician (Ph.D. Humboldt Universität zu Berlin) and Principal Data Scientist at PyMC Labs. He is interested in interdisciplinary applications of mathematical methods. In particular, time series analysis, Bayesian methods, and causal inference. **Lightning talks** There will be slots for 2-3 Lightning Talks (3-5 Minutes for each) between the two main talks. Kindly let us know if you would like to present something :) \*\*\* NumFOCUS **Code of Conduct** THE SHORT VERSION Be kind to others. Do not insult or put down others. Behave professionally. Remember that harassment and sexist, racist, or exclusionary jokes are not appropriate for NumFOCUS. All communication should be appropriate for a professional audience including people of many different backgrounds. Sexual language and imagery are not appropriate. NumFOCUS is dedicated to providing a harassment-free community for everyone, regardless of gender, sexual orientation, gender identity, and expression, disability, physical appearance, body size, race, or religion. We do not tolerate harassment of community members in any form. Thank you for helping make this a welcoming, friendly community for all. If you haven't yet, please read the detailed version here: https://numfocus.org/code-of-conduct \*\*\*

Join us for an evening on the practical side of AI agents. We'll dig into context engineering and why relevance matters more than prompt tricks, then look at what it takes to run autonomous agents safely alongside humans. Food and drinks provided — stick around after for networking. ✍️ RSVP asap as capacity is limited so grab your spot asap! 📅 **Date and Time** Wednesday, May 27, 2026 from 18:00-20:45 📍 **Location** [EBCONT office, beyond Quartier Heidestrasse, 34, 10557 Berlin](https://maps.app.goo.gl/aQGPgteqhQ2yrmx96) 📝 **Agenda** 18:00 – Doors open, arrivals and check-in 18:20 – Welcome note by EBCONT 18:30 – **Agent Builder Hope is not a strategy — relevant context for data driven agents** by Anderson Queiroz — Elastic *What are agents and context engineering? And why we think the "center of gravity" for context engineering is much more about relevance and your data than only prompts and memory management.* 19:00 – Q&A & quick break 19:15 – **Adapting to AI in Security** by Jenny Pinheiro — Tines *Best practices for autonomous AI and human interaction in the context of workflows.* 19:45 – Pizza, drinks & networking \*\*\* Invite your friends and join us for an evening of learning and networking with fellow engineers and speakers! Thank you to **EBCONT** for hosting and to **Tines** for teaming up with us on this one!

**Build for Everyone — Accessibility for Mobile** Flutter Berlin is hosting a joint meetup with Kotlin User Group Berlin and CocoaHeads Berlin, focused on building accessible mobile apps. **Location:** Hedwig-Dohm-Haus, Berlin We’ll cover both strategy and hands-on implementation — from understanding platform differences (Android, iOS, cross-platform) to real-world accessibility pitfalls and live testing. With: **Important:** Registration is via Luma, not Meetup. Please register here: https://luma.com/xo7d3vb4

"No half-thruths, just naked minds” Welcome to the comedy show where you can see unfiltered comedians speak their thruth since almolst 5 years! Their topics can range from their last sexual encounter to why they hate chickens and how to win a fight with a chesse sandwich. So expect any kind of material from clean to the very dark. Each comedian will have between 5-10 minutes to make you laugh. The show is located in the cozy Agata Bar on Weichselstraße 55 in Neukölln - open for all of those who appreciate cozy nights and a fine selection of drinks and good mood. The space is limited, so the early bird catches the worm - get a reservation for your own good! Doors: 19:30 Show: 20:00 Get your free reservation now & pay what you want for the show! *Reservations are only kept until 20:15, so please arrive before that for assured seating.

**Bob on Tour – IBM Bob live erleben 💙** Wie fühlt sich ein agentischer Coding Assistant im echten Entwicklungsalltag an? Bei **Bob on Tour** kannst Du IBM Bob gemeinsam mit Expert:innen hands-on ausprobieren. In einem eintägigen, technisch fokussierten Format arbeitest Du an realistischen Coding-Aufgaben, von geführten Labs bis zur Anwendung auf eigene Use Cases. Dabei lernst Du, wie Bob Entwicklungsworkflows ergänzt, Codebasen verständlicher macht und mehrstufige Aufgaben unterstützt. **Das nimmst Du mit:** ✅ Sicherer Umgang mit den wichtigsten Bob-Funktionen ✅ Praktische Erfahrung mit agentischer Coding-Unterstützung ✅ Impulse für reale fachliche und technische Problemstellungen 👉 **[Jetzt anmelden und IBM Bob live erleben](https://luma.com/5g0x9318)**

## DNA. presents: "CREATIVE WRITING & WINE" \- A space where creativity flows and every sip inspires\. Settle into Your Wednesday evening with a glass of wine in hand and step into a cozy, inspiring atmosphere made for sharing stories, listening deeply, and letting Your own voice come alive. Our storytelling and poetry evenings are open to everyone — whether You're just beginning to explore spoken word or You’ve been writing for years. No pressure, just presence. ##### *With gentle, uplifting prompts and space to express Yourself, You’ll create, share, or simply enjoy the power of words in a warm, welcoming circle.* Whether You’re planning a soulful midweek date, coming alone to unwind, or meeting friends for something different, this is Your moment to connect, reflect, and celebrate the beauty of language. ##### *Each gathering offers something new: fresh themes, meaningful conversations, unexpected moments of truth, and a community that listens with its whole heart.* ##### ‍ See Us Soon :) Love. Garen & DNA. *** ‍ For more insights, follow us on IG: [@nightart.club](https://www.instagram.com/nightart.club) \*Members of Dair Night Art e.V. and Subscribers of DNA. Art GbR.

This is another event from the "All in Kubernetes" event series. This group is focused on using Kubernetes for everything. All in Kubernetes. Data, databases, AI, ML, and all kinds of stateful workloads on Kubernetes and Talos. *** **Schedule:** 6:00-6:30pm - Open doors, pizza, drinks & networking 6:30-7:15pm - (Em)Powering Postgres with Talos and Simplyblock - [Chris Engelbert](https://www.linkedin.com/in/noctarius/?utm_source=luma), Simplyblock 7:20-8:05pm - How Talos Makes It Easier To Build a Cluster Management Platform - [Utku Özdemir](https://www.linkedin.com/in/utkuozdemir/?utm_source=luma), Sidero Labs 8:05-8:45pm - Drinks & Networking **​Who Should attend:** Anyone interested in talking and learning about Data, AI and Stateful workloads on Kubernetes and Talos. ​ **When & Where:** May 27th, 2026, 6:00pm Antler office, Jägerstraße 32, 10117 Berlin Sponsored by [Sidero Labs](https://www.siderolabs.com/), [simplyblock](https://simplyblock.io/) and [Antler](https://www.antler.co/)

**Rust Berlin Talks** is back for another evening of talks, shared ideas, and networking. Join us to learn, share, ask, and connect. If you work with Rust professionally, use it in side projects, contribute to open source, or are simply curious to learn more, you are very welcome. **Agenda** * Doors open: 18:30 * Start: 19:00 * Talks * Open mic / lightning talks * Networking **Speakers** Egor Lebedev - Welcome and a short note from the RustRover team Wolf Vollprecht - Pixi - A cross-platform package manager written in Rust One more speaker - To be announced soon **Speaker Bios** Wolf Vollprecht is the founder and CEO of prefix.dev, where he builds open-source software supply chain infrastructure for the conda ecosystems. Core projects include Pixi (a cross-platform package manager written in Rust), rattler (crates to work with Conda packages), and rattler-build. With \~7 years in the conda ecosystem, including creating Mamba during his time at QuantStack, Wolf has a lot of experience in making package management fast, reproducible, and secure. **Open mic & future talks** We’ll reserve a few short slots for anyone who wants to share something with the group. This can be a quick idea, a project, or an experience. Slides are optional. If you’re interested in giving a longer talk at a future meetup, this is also a good opportunity to connect with the organizers. **Venue & access** Please arrive on time. We will have someone at the entrance to let people in between 18:30 and 19:15. After that, access becomes more difficult as the doors are locked and require manual opening. **Registration** The venue has limited capacity and events typically fill up with a waiting list. If you register and can no longer attend, even at short notice, please un-RSVP so someone else can take your spot. Looking forward to seeing you all!

Meet up and join other people at the biggest meetup event in Berlin this Saturday! Whether you're a long-time resident or just traveling through, come and meet new people to have fun, make new friends and enjoy your Saturday evening in a **safe and welcoming** environment at one of Berlins fantastic locations. You can **pick up pizza at the venue** and/or stay with and party on the dance floors all night long! **IMPORTANT: AFTER 21:00 Birgit turns into club, so there is a charge of €15 to enter the venue or you may be refused entry by the people on the door, BUT if you arrive before then you can stay the whole night for FREE!!!** **ONLY CARDS** **FIND US BY LOOKING OUT FOR THE SIGNS ON THE TABLES!!** We always have several organisers there (male and female), so come say hello to us! We care to make sure that everyone enjoys themselves and we have **no tolerance for bad behaviour or creepiness.** Looking forward to seeing you there! **Follow us on Insta:** https://www.instagram.com/siphappens.berlin/ **Join us on Telegram:** t.me/siphappens_berlin **👉 Other important notes:** \- 🍸 The locations we visit are bars and clubs\, they are businesses and we are able to keep these events free ONLY if people buy drinks\. Please respect the locations and the event by making purchases \- 🦹‍♂️ Remember to keep an eye on your belongings and prioritize your own well\-being\. We are not responsible for any lost items or personal issues\. \- 📷 By attending our events\, you consent to being photographed or filmed\. Photos and videos taken during the events may be shared on our social media\. If you do not wish to appear in the photos or if you appear in a photo that we post that you would like removed\, please send us a private message as soon as possible on Instagram \(@siphappens\.berlin\)

Welcome to our cosy Godot Engine Community Meetup! This is not a structured meeting, but rather a friendly get-together. We will hang out, chat and maybe show some of our current projects! 🦜 Regardless if you are an artist, designer, programmer, beginner, hobbyist, professional or anything in between: join us for sharing knowledge, creating art together, coding together, joining game jams together and having fun! 🌼 This meetup will happen at [Saftladen Game Collective](https://saftladen.berlin), Normannenstraße 1-2, 10367 Berlin-Lichtenberg. 🌳 You can also join us on [our Discord Server](https://discord.gg/Sm3CgrqqQa). ☎️ Follow us on [Mastodon](https://mastodon.gamedev.place/@GodotUserGroupBerlin) for updates. 📢 Also check out [our website](https://godot.berlin). 🌐 Please be [excellent to each other](https://godotengine.org/code-of-conduct/)! 🕊️

## A space where creativity flows and inspiration comes to life. Start Your weekend afternoon in a relaxed and welcoming atmosphere made for painting, connecting & enjoying the moment. Whether You know it as Drink & Draw, Sip & Paint, or Wine & Paint, this experience brings together the best of art, people & good energy — all in one place. With easy and encouraging guidance from our Creative Teachers, You’ll create Your own artwork using acrylic paints and oil pastels, while enjoying a calm & inspiring environment. ‍ Our Painting Sessions are perfect whether You’re just starting out or already have experience — no pressure, just creativity and fun. ‍ ##### WHEN: Every Friday: "Date & Paint Edition" – for singles & couples to connect and meet new people 4 – 5:30 pm Every Saturday: "Creative Flow Edition" – start Your Saturday with art and inspiration 4 – 5:30 pm Every Sunday: "Chill Vibes Edition" – slow, mindful painting for a smooth Sunday 4 – 5:30 pm > Whether You’re planning a date, taking time for Yourself, or meeting friends, this is Your moment to relax, express Yourself &take home something You created. ‍ ##### INCLUDES: All materials (canvas, acrylic paints, oil pastels, brushes & more) ##### SIGN UP & TICKETS: No registration needed. Simply come by & get Your ticket at the box office before the session. LEVEL: All levels WHAT YOU NEED: All materials provided (canvas, acrylic paints, oil pastels, brushes & more) COSTS: €20 General (Tickets at the Box Office) \- Free FOR DNA\. MEMBERS ‍ See You soon :) Love. DNA

While we are approaching the middle of the year and KotlinConf is just over - we are thrilled that Trade Republic hosts us again! So mark the date! **Line-Up:** 👉 **Lists, Sequences, and Flows: Scaling Data Processing in Kotlin without Melting Your Memory.** *by Daniela Valero* In this talk, Daniela shares her journey of meeting a major backend deadline while managing a data pipeline's memory footprint. You’ll learn how to transition from eager List operations to lazy Kotlin Sequences and jOOQ Streams (using database fetchSize chunking) to keep memory usage flat. Finally, we’ll explore using Kotlin Coroutines and Flow to introduce safe concurrency so your data processes quickly without straining your database. 👉 **The show must go on** Kotlin-based Kafka dead-lettering solution without external (system) dependencies *by Blagoja "Baki" Stamatovski* **👉 Job Market Insights from a Kotlin developer** *by* Ivan Gafurov **Speaker Bios:** 🗣 **TDB**

**Berlin, let’s talk agents. 🚀** We’re bringing the local AI community together for another evening focused on the fast-evolving world of **generative AI and autonomous agents** — and how teams are turning them into practical, scalable solutions. The meetup will feature a short session on what it really takes to **operationalize AI agents**: from design and deployment to oversight, orchestration, and management in production environments. After that, the floor is yours — with plenty of time to meet other builders, exchange perspectives, and continue the conversation over food and drinks. **What to expect:** 🎤 A featured talk on building and managing AI agents in practice 👀 A closer look through live demos 🤝 Informal networking with AI practitioners, builders, and innovators 🍻 Discussions with the Berlin data & AI community over drinks and pizza Whether you’re already experimenting with multi-agent systems or just starting to explore the space, this meetup is a chance to hear how others are approaching the challenge, share ideas, and connect with peers in Berlin.

Join us for an upcoming in-person Lean Coffee meetup. Lean Coffee is a lightly-structured meeting format where the attendees create the agenda. Bring your management challenges; whether you're managing people, products, processes or beyond, and solve them together with peers from a diverse set of backgrounds. This event is great for anybody trying to create better ways of working and wants to share with + learn from others trying to do the same.

Columbus Code & Coffee is an inclusive, informal co-working session. People of all skill levels attend, and we love it that way. Many people (optionally) bring projects to work on, and many other people (optionally) socialize the entire time. It's entirely up to you! **What to Expect at the Intro Circle** \~\~\~\~\~\~\~\~\~\~\~\~\~ Near the beginning of the event (1:30 pm), we do a standup: * Organizer announcements, updates, and logistics Round 1 - (7 secs max): * Your name * What you're working on * What you can help others with Round 2: * Community events you wanna plug. If none, that's cool too. Round 3: * Job opportunities you're hiring for OR announce that you are looking for one. If none, that's cool. After the introduction circle, everything is self-organized! Feel free to work alone, pair up, attend one of our workshops/presentations, or mingle!

Columbus Code & Coffee is an inclusive, informal co-working session. People of all skill levels attend, and we love it that way. Many people (optionally) bring projects to work on, and many other people (optionally) socialize the entire time. It's entirely up to you! **What to Expect at the Intro Circle** \~\~\~\~\~\~\~\~\~\~\~\~\~ Near the beginning of the event (1:30 pm), we do a standup: * Organizer announcements, updates, and logistics Round 1 - (7 secs max): * Your name * What you're working on * What you can help others with Round 2: * Community events you wanna plug. If none, that's cool too. Round 3: * Job opportunities you're hiring for OR announce that you are looking for one. If none, that's cool. After the introduction circle, everything is self-organized! Feel free to work alone, pair up, attend one of our workshops/presentations, or mingle!

Main Library, Meeting Room 2B Join us for a welcoming evening of reflection, gentle music, and meaningful conversation. We’ll begin with a short grounding moment, followed by a brief reading from spiritual or philosophical traditions, and an open reflection circle where participants can share (or simply listen). Libera Animae is an interfaith community focused on inner growth, creativity, and authentic connection. All backgrounds are welcome.

**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** Like it or not, AI agents are now capable of turning a quickly written paragraph of requirements into a pull request that is ready to be integrated into real-world production applications and it's now our responsibility to make sure AI doesn't go rogue and take down prod - or corrupt our data by misunderstanding the requirements or our existing schemas. In this session we'll explore strategies to protect our codebases through unit and integration testing, documentation, and code review along with additional ways of providing context and guard rails to our AI agents as they carry out the work we've assigned them to do. By the time we're done, you'll have a firm grasp of the problem and understand some helpful options for protecting your codebase from vibe coding mishaps getting YOLOed into prod. **YouTube Link** https://youtube.com/live/BltmWMH1zG0?feature=share

Come out to Improving for our monthly iOS and Mac meetings. This Month's Presentation: Nothing yet. (You should volunteer). What is Cocoaheads (http://cocoaheads.org/)? CocoaHeads is a group devoted to discussion of Apple Computer's Cocoa Framework for programming on MacOS X and iOS (including the iPhone, iPad and Apple Watch). During monthly meetings, members present on their projects and offer tutorials on various programming topics. What is BuckeyeCocoa (http://buckeyecocoa.org/)? BuckeyeCocoa is a group of Objective-C/Swift developers/enthusiasts. We host monthly Cocoaheads and near-weekly NSCoder meetings in Columbus, Ohio. The meetings are free to attend. Presentations! Presenters welcome! We are always in need of people willing to present material. Any Swift and/or Objective-C related topic is welcome. Times can be 5 minutes (i.e. lightning talks) to a maximum of 2 hours. Interested? Contact info is on the BuckeyeCocoa website. To volunteer for a presentation contact us at @BuckeyeCocoa on Twitter. Follow us on Twitter! @BuckeyeCocoa (https://twitter.com/#!/Buckeyecocoa/) For more information: http://buckeyecocoa.org/

**Latest Dojo Location!** **Knotty Pine Brewing** 1765 W 3rd Ave, Columbus, OH 43212 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 speakers for our Monthly Meetups! Fill out the form if you are interested in presenting to the Python Community. https://forms.gle/ehSfUAC2WgR34Crq9