Delphi

The next **Berlin C++ Meetup** hosted by think-cell takes place on **Tuesday, May 26**. Join us for an evening with the Berlin C++ community! This meetup is a chance to step away from your day to day work, meet other developers, exchange ideas, and have real conversations about modern C++ in a relaxed setting. \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- ## **Talk** ### **Contract assertions on virtual functions** *Timur Doumler – Citadel Securities* Contracts assertions were introduced in C++26, but they cannot be applied to virtual functions. To close this gap, we first need to answer the question: how should contracts assertions behave in the presence of inheritance and runtime polymorphism? In this talk, Timur explores why this problem is harder than it looks. He reviews existing approaches from other languages, such as Eiffel, D, and Ada, highlights why they don’t fully translate to C++, and outlines the key design challenges involved. He then presents a concrete proposal for how contract assertions on virtual functions could work in C++, balancing correctness, safety, and usability. Along the way, the talk touches on good API design, the true meaning of the Liskov substitution principle, and how to reason about program correctness. \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- 📅 **Date & Time:** Tuesday, May 26, 2026 – 18:30–21:30 📍 **Location:** Le Wagon Coding Bootcamp, Rudi-Dutschke-Straße 26, 10969 Berlin 5th floor 🕒 **Agenda** 18:30 – Doors open 19:00 – Talk + Q&A 20:40 – Pizza, Drinks and Networking \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- **RSVP now to save your seat!**

**8 WEEKS CLASS FOR BEGINNERS** **FROM BASIC SHAPES TO FIGURE** with live model **MATERIAL INCLUDED!** [BOOK IT HERE](https://berlinschoolofdrawing.weebly.com/2-months-class-on-drawing.html) TUE. 5 TO 7 PM from APRIL 21st to June 23rd 2026 8 classes of 2 hours ( no class on MAY 5 and 26th ) 210€ IN TOTAL 35€ drop in option Included in the price: ALL MATERIALS PROGRAM: The aim of this course is to learn and deepen the basic skills of drawing and figure drawing. Students will learn the fundamentals of drawing through observation, instinct, and traditional methods in a winning combination. Focus will be on the main points of traditional drawing, such as structure, volume, shading, framing and composition as well as the human figure. Through a step by step program, you will learn how to bring what you see onto paper and how to finish with a completed chiaroscuro drawing. These skills are an essential foundation for further personal artistic exploration. MAIN POINTS OF THE CLASSES: • how to draw what we see • how to see lines and volume • proportions and shapes • how to do shading / chiaroscuro • how to use materials • how to sketch and define figures • work on different pose's lenght • how to apply all that you learn **DETAILED PROGRAM OF THE CLASS ON THE** [WEBSITE](https://berlinschoolofdrawing.weebly.com/2-months-class-on-drawing.html)

## Learn Go and NixOS deployments with large language models Hello, 世界! When used sensibly, language models can be tutors, too. For meetup #60 on Tuesday [May 26, 2026 19:00 CET](https://www.meetup.com/leipzig-golang/events/312537727) we are really happy to have [Maxime](https://www.linkedin.com/in/plumps/) dive into Nix/NixOS with the help of language models. Nix is a functional package manager and its immutable traits enable robust, reproducable deployments of Go (and other) projects. The high level goals of Nix/NixOS are similar to other immutable Linux distributions, like [Silverblue](https://fedoraproject.org/silverblue/) or [Bazzite](https://bazzite.gg/). Becoming familiar with the Nix configuration language can be a challenge, but one that a well instructed tutor may help with. > Artificial intelligence techniques are increasingly used in education to enable personalized learning and intelligent tutoring [LLM Agents for Education: Advances and Applications](https://aclanthology.org/anthology-files/anthology-files/pdf/findings/2025.findings-emnlp.743.pdf) (11/2025) Why reproducible and immutable deployments play a role? [Justin Garrison](https://justingarrison.com/blog/state-of-immutable-linux/) says: > It’s 2026, if you’re not using something immutable (or at least reproducable) you’re doing more maintenance work than you should. [blog post recapping talk from [Southern California Linux Expo 23x](https://www.socallinuxexpo.org/scale/23x)], 03/2026, PASADENA, CA ### Schedule * 18:45 Doors open * 19:00 Welcome * 19:10 Dive into Nix/NixOS with LLMs * 19:50 Open discussion We’ll meet: * in person at [Basislager Leipzig](https://basislager.co), at [Peterssteinweg 14, 04107 Leipzig](https://maps.app.goo.gl/1fMkeDSPZ7Aauszh8) ([OSM](https://www.openstreetmap.org/node/3504864558)) * and online via [https://meet.google.com/drk-bptj-xss](https://meet.google.com/drk-bptj-xss) Join us to discuss robust Go deployments, language models as learning tools and more!

**[8 WEEKS CLASS FOR BEGINNERS](https://berlinschoolofdrawing.weebly.com/2-months-class-on-drawing.html)** **[FROM BASIC SHAPES TO FIGURE](https://berlinschoolofdrawing.weebly.com/2-months-class-on-drawing.html)** [with live model](https://berlinschoolofdrawing.weebly.com/2-months-class-on-drawing.html) **MATERIAL INCLUDED!** TUE. 5 TO 7 PM from APRIL 21st to June 23rd 2026 8 classes of 2 hours ( no class on MAY 5 and 26th ) 210€ IN TOTAL 35€ drop in option [BOOK IT HERE!](https://berlinschoolofdrawing.weebly.com/booking---contact--venue.html) Included in the price: ALL MATERIALS PROGRAM: The aim of this course is to learn and deepen the basic skills of drawing and figure drawing. Students will learn the fundamentals of drawing through observation, instinct, and traditional methods in a winning combination. Focus will be on the main points of traditional drawing, such as structure, volume, shading, framing and composition as well as the human figure. Through a step by step program, you will learn how to bring what you see onto paper and how to finish with a completed chiaroscuro drawing. These skills are an essential foundation for further personal artistic exploration. MAIN POINTS OF THE CLASSES: • how to draw what we see • how to see lines and volume • proportions and shapes • how to do shading / chiaroscuro • how to use materials • how to sketch and define figures • work on different pose's lenght • how to apply all that you learn **DETAILED PROGRAM OF THE CLASS BELOW :** To begin, the students will work from Still Life and objects in order to learn how to bring what they see to the paper. The step by step program will go through the fundamentals of perspective, volume, proportions- all of the skills required to draw anything, whether it be still life, people, nature, or animals. The students will then begin working from the model. Students will learn how to identify the main driving forces and masses of the body. The 'bean' approach will help the students see the basic 3-dimensional structure of the body. With professional models posing under controlled lighting for shadows and contrast.

We are back in the c-base! Do you already run NixOS and want to talk to other people or want an introductory session with some NixOS users. Just bring your machine! Usually there are no topics, we just sit in front of our computers, talk about stuff, debug some problems or review some PRs on nixpkgs. There are drinks usually available from the c-base bar. If you can't find us. just ask around or ask in irc (#krebs on hackint)

BHNT #112: the fifth BHNT in 2026. The title is inspired by the issues around Bambulab (Boo). Your hacks do not have to be connected to the title (bonus points if they do though) Please RSVP and bring your hacks! There are 8 dynamically allocated Slots that consist of 5min presentation + 5min conversation with the audience. To refresh your memories or get familiar with the concept - see some old hacks here: [https://bhnt.c-base.org](https://bhnt.c-base.org/) Hope to see you - looking forward! [RSVP here](https://platform.openmeet.net/events/bhnt-112-bamboo-hacks-8zv0v)

​Informal meetup for people interested in OpenClaw and AI agents. We share what works/what doesn't and what we’re currently trying. Feel free to bring your laptop and half-working setup. We're all here to learn how to ride the tiger \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- ​Events usually unfold in two parts: 1st part - People showcase projects, tools, setups and discuss learnings 2nd part - Open discussion/networking

Thoughtworks is happy to host our friends from Philia. Philia is a community that endorses mutual support and sisterhood as a global empowerment network. We will come together for an evening full of new and positive connections: **Join us for an inspiring Women’s Empowerment Meetup! 🌟** Connect with like-minded women, share your stories, and empower each other in a supportive and inclusive environment. This event is designed to foster connections, build confidence, and provide valuable insights for personal and professional growth. **What to Expect:** * **Engaging Discussions:** Participate in thought-provoking conversations on topics that matter to you. * **Networking Opportunities:** Meet and connect with women from diverse backgrounds. * **Empowerment Exercises:** Take part in activities designed to boost your confidence and self-awareness. **Prepare for the Meetup:** Before attending, we encourage you to complete the **[Energy Snapshot](https://wearephilia.com/)**[ ](https://wearephilia.com/)**[Exercise](https://wearephilia.com/)**. This exercise will help you gain deeper insights into your energy levels and prepare you for a more enriching experience at the event. **Learn More & Join Us Elsewhere:** To learn more about who we are, discover other upcoming events, and find out how you can get involved with our community, visit this page: **[Philia Meetups Overview](https://wearephilia.notion.site/Welcome-to-Philia-cfdfbff0725b421a9555bb2ae6f9dd20)** Don’t miss this opportunity to empower yourself and others in a dynamic and supportive setting. We look forward to seeing you there! If you wanna know more about this great community around The Philia Project, check out their [Meetup page here](https://www.meetup.com/de-DE/global-womens-empowerment-network/). \-\-\-\-\-\- **Code of Conduc**t We adhere to the [Berlin Code of Conduct](https://berlincodeofconduct.org/) to ensure a welcoming and respectful environment for all participants. The event space operates under largely compatible [Thoughtworks Meetups & Events CoC](https://www.thoughtworks.com/en-de/about-us/events/code-of-conduct-germany). **Accessibility** The Location is accessible for wheelchair users. This includes the entrance (no steps to get into the location), toilets and the stage.

Join us for an inspiring life drawing session in Vetomat, Berlin. Our sessions provide a supportive and creative space for artists of all levels to practice figure drawing in a relaxed environment. Whether you are an experienced artist or just starting out, our group welcomes everyone to come together and explore the art of life model drawing. Channel your creativity and hone your skills as you sketch our professional life model during our dynamic sessions. You can expect a friendly and inclusive atmosphere, where you can exchange ideas, techniques, and feedback with fellow artists. No ticket required, payment is by donation, suggested amount is 10,-

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 \*\*\*

✨ Japanese Inspiration Brunch & Kintsugi Workshop ✨ 📅 31 мая 🕚 11:00 📍 Café Pirouette Saarbrücker Straße 17, 10405 Berlin Приглашаем вас на вдохновляющее утро, посвящённое Японии, её красоте, культуре, путешествиям и философии искусства видеть красоту даже в трещинах и несовершенствах. В программе: 🌸 Знакомство с философией кинцуги — японским искусством «золотого ремонта», где трещины и шрамы жизни не скрывают, а подчёркивают. 🎨 Творческий мастер-класс с использованием золотого маркера: превращаем «повреждения» в часть красоты. ⛩ Разговор о Японии: её культуре, эстетике, красотах и достопримечательностях. ✈️ Путешествия в Японию: различные варианты, возможности и интересные идеи для поездок. 🍵 Небольшая чайная церемония и sushi compliment включены. ✨ Ведущая: Dr. phil. Anna Hörath Исследователь культурного интеллекта через сказки, мифы и легенды. Гипнокоуч, психолог-консультант, специалист НейроГрафики и Лабиринтов Развития. Защитила диссертацию в Университете Потсдам (Германия) о влиянии греческой мифологии на ранние произведения Антона Чехова. 💶 Стоимость участия: 25 €

**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!

**The TypeScript Berlin meetup is back!** After a long break, we're reviving the meetups for 2026 and we'd love to see you there. Whether you've joined us before or you're coming for the first time, welcome! Come round for talks, snacks, good conversations, and a chance to connect with other TypeScript devs in Berlin. *** **🎙️ Interested in speaking?** We have an ongoing call for speakers for this event as well as future ones. [Fill it out here](https://tally.so/r/jaGa1J). *** **📅 Schedule** * 18:30 - Doors open, drinks and snacks 🍕 * 19:00 – Welcome 🤝 * 19:05 - Talk 1: TBC 🎙 * 19:35 - Talk 2: TBC 🎙 * 20:05 - Break 🥤 * 20:20 - Talk 3: "**Prisma Next: AI-Native, Graph Migrations, Extensions & Middleware**" by [Will Madden](https://www.linkedin.com/in/willmadden/) 🎙 * 20:50 - Wrap-up * 21:00 - Doors close 👋 *** This meetup is organised by [Prisma](https://www.prisma.io/). By attending the event, you agree to abide by our [Code of Conduct](https://www.prisma.io/event-code-of-conduct). For questions, reach out to events@prisma.io

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** *by Blagoja "Baki" Stamatovski* **👉 TBD** **Speaker Bios:** 🗣 **TDB**

**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

Do you feel introverted when you are in a group setting? Are you shy? Do other people have more fun than you do? There are simple life hacks you can use to improve your connection to others and improve your social life. Talking is one thing. Truly connecting is altogether another. It's the whole experience of connecting with people and forming relationships. It includes the joy, understanding, and love formed among people. * In our meetings, you will learn: * A simple life hack to increase your liking and tolerance of other people, or even of yourself! * How to become more interested and enjoy conversations with people. * How to be comfortable in social settings. * How to be yourself * How to become more extroverted and, * How to make connections with people. Feeling lonely, isolated, or bored? This local meeting is exactly what you need! Come join us! Be sure to click on the red "Attend" button below to come to the local event. We look forward to seeing you there. This group is created by the Dianetics and Scientology life improvement center.

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

**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

Let's mix and boogie! We'll start with social time over dinner/appetizers/drinks from 6:00-8:00pm. Then we'll get down with a live band [Shucking Bubba Deluxe](http://www.shuckingbubba.com/). COVER CHARGE: $10.00 (cash) SBD: A great danceable cover band playing popular genres of music - funk, classic rock, pop & club/dance. [Harry Buffalo](http://www.harrybuffalo.com/locations/westerville/) has a wide selection of quality appetizers and entrees. Harry Buffalo seating is first come/first serve this evening. We need a few folks to be there by 6:00pm or so to secure a table on the patio. DRESS: Late Summer Patio (picnic table friendly) BAD WEATHER CANCEL (usually by 4pm) PARKING: lots near restaurant and down the street. Do not park at Taco Bell.

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/