Revit

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!**

Join our Women’s Circle at "Das Kabbalah Centre" in Berlin, hosted by Rachel Wende. Language: English. This event is open for new and current students. Amount: EUR 05.00 - 15.00 [Register here](https://onehouse.kabbalah.com/de/events/womens-circle-rw-26mai26-1778598265129619/) Living a purpose-driven life is something we all strive for. Such a life promises that we are using our talents, sharing of ourselves, and working towards goals that are fulfilling and inspiring. Staying on the path requires daily effort and yet, with all the responsibilities that we have as women, sometimes that purpose-driven life seems like a worthy goal for sometime after we’ve fulfilled the needs of our partners, children, and jobs. Join us for an intimate women’s circle as we share insights and tools for how to revitalize our search for our purpose. Learn how to get out of patterns and routines that keep us from making the changes we deeply desire. Our path to fulfillment lies within each of us; we only need to tease it out. The Kabbalah Centre Berlin Hauptstraße 27 Entrance E / 1 Floor 10827 Berlin

Wir bieten allen Interessierten die Möglichkeit, mit Elektronik zu basteln. Workshops und Vorträge zu verschiedenen Themen rund um Elektronik und Software sind willkommen. Von Arduino bis zu komplett selbst entwickelten High-End Schaltungen sind wir für alle kreativen Ideen offen. Wir haben auch Gruppen rund um das Nähen, Programmieren, Retro Computer. Wir treffen uns immer am Dienstag und am Freitag ab 18:00 Uhr. Egal ob Anfänger oder Profi – hier seid Ihr jederzeit Willkommen. Ihr könnt mit anderen fachsimpeln oder auch mit unserer Hilfe Eure ersten elektronischen Gehversuche starten. Wenn zeitgleich in den vorderen Räumen Workshops oder Vorträge stattfinden, kann hinten Werkstattbetrieb stattfinden.

​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

**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)

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)

Hallo zusammen! In Rahmen der PAKD Gallery Kurse bieten wir euch einen Zeichenkurs an. Wenn Ihr Zeichnen liebt und eure Fähigkeiten weiterentwickeln möchtet, dann seid Ihr hier genau richtig. In diesem Video erzähle ich euch von meinem Kurs für realistisches Zeichnen mit Bleistift - und wie er Eure künstlerische Arbeit auf ein neues Level bringen kann. Hattest Du schon immer das Gefühl, zeichnen können zu wollen - Dir fehlt aber die richtige Anleitung? In diesem Kurs lernst Du realistisches Zeichnen mit Bleistift, einfach, verständlich und Schritt für Schritt: • Korrekte Perspektive • Licht und Schatten • Materialdarstellung wie Glas, Keramik, Stoff, Metall Der Kurs ist perfekt für Anfänger und für alle, die ihre Fähigkeiten verbessern möchten. Wenn dieses Video Eure Leidenschaft für das Zeichnen mit Bleistift geweckt hat, dann schickt mir einfach eine E-Mail und lasst uns gemeinsam eure Reise in die Welt des realistischen Zeichnens mit Bleistift beginnen. Kleiner Kurs, große Wirkung. Maximal 12 Teilnehmer\*innen! Anmeldung:Ä [kifan@pakd-gallery.com](mailto:kifan@pakd-gallery.com) Sichere dir deinen Platz, bevor alles ausgebucht ist. Dienstag 18:30 - 21:30 Uhr. 25€ für eine einzelne 3- stündige Einheit 200€ für ein 10er-Paket, flexibles einlösbar.

**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

Bang! Bang! Now in its ninth year of hilarity, Revolver is Berlin’s oldest, organic and homegrown English comedy show that happens at Wows.ville. ***[Reserve a seat here 💥](https://www.eventbrite.de/e/revolver-the-comedy-show-with-a-bang-29-may-tickets-1989169108350?aff=erelexpmlt)*** Bring in the weekend with a night of laughter. Revolver features funny people from all over planet Earth. The show is hosted and curated by international comedian and Berlin’s favourite immigrant \~ [Rohit Bhatia.](http://%5Bhttps//%5B%5Bwww.thebhatia.com/%5D%5D%5D(%5Bwww.thebhatia.com/%5D%5D)(%5Bwww.thebhatia.com/%5D%5D(www.thebhatia.com/%5D))(%5B%5Bhttps://www.thebhatia.com/%5D%5D(https://www.thebhatia.com/%5D)(%5Bhttps://www.thebhatia.com/%5D(https://www.thebhatia.com/))) "\[\[\[https://www.thebhatia.com/\](https://www.thebhatia.com/)\](https://www.thebhatia.com/)\](\[https://www.thebhatia.com/\](https://www.thebhatia.com/))") **Entry : 10 €.** The bar and the event is Cash only. No plastic. No smoking during the performances. Nice people only! Please do not transfer money over the internet. We do not sell tickets online, only reservations are taken. These reservations are held till 8.30 pm on the day of the show. **Doors : 8 pm** Revolver is an original and independent Berlin comedy mic. No gimmicks, no games, no donation scam. We have no branches, please be aware of cheap imitations. Revolver happens every Second and Last Friday of the month.

Unser Verein berlinCreators e.V. trifft sich jeden Freitag ab 18 Uhr im Makerspace. Wir haben Gruppen rund um Elektronik, 3D-Druck, Nähen, Programmieren, Retro Computer. Egal ob Anfänger oder Profi – hier seid Ihr Willkommen. Ihr könnt mit anderen fachsimpeln, Euch inspirieren lassen oder auch mit unserer Hilfe Eure ersten Projekte starten. Wenn Ihr Euch bei uns wohlfühlt und Mitglieder bei den berlinCreators werden möchtest, freuen wir uns. Kommt vorbei, lernt den Space, uns und die Möglichkeiten kennen.

## **Weekly Concert Series – Nikolaikirche, Berlin-Mitte** A continuing Friday concert series featuring organ music and extended formats in the historic Nikolaikirche, Berlin-Mitte. The series is **mostly performed by women organists** and is organised by Jack Day (the convenor of this musical Meetup group). *** ### **Key information** * 📍 **Venue:** Nikolaikirche, Berlin-Mitte * 🕒 **When:** Fridays * 🎟 **Entry:** €5 (pay at the door) * 🎶 **Format:** Organ concerts, occasionally with guest musicians (violin, kamantsche, voice, performance) **2026 (until October):** 2 Jan: **William Peart** \| 9 Jan: **Jack Day & Elham Hamedi** \| 16 Jan: **Hanna Cho** \| 23 Jan: H\. Cho \| 30 Jan: **Miriam Theresa Riebeck** 6 Feb: **Lillia Pechenkina** \| 13 Feb: L\. Pechenkina \| 20 Feb: L\. Pechenkina \| 27 Feb: J\. Day & **Moss Beynon Juckes** 6 Mar: **Wanying Lin** \| 13 Mar: W\. Lin \| 20 Mar: W\. Lin \| 27 Mar: J\. Day & E\. Hamedi 3 Apr: **Mio Kuriyama** \| 10 Apr: **NO CONCERT** \| 17 Apr: M\. Kuriyama \| 24 Apr: J\. Day & **Kristina Griep** 1 May: **Kirstin Gramlich** \| 8 May: **Shiye Guo** \| 15 May: **Sander van den Houten** \| 22 May: S\. Guo \| 29 May: S\. Guo 5 Jun: W\. Lin \| 12 Jun: W\. Lin \| 19 Jun: W\. Lin \| 26 Jun: J\. Day & M\. B\. Juckes 3 Jul: H\. Cho \| 10 Jul: **Lea Rahel Bader** \(cello\) \| 17 Jul: H\. Cho \| 24 Jul: H\. Cho \| 31 Jul: H\. Cho 7 Aug: H\. Cho \| 14 Aug: W\. Peart \| 21 Aug: W\. Peart \| 28 Aug: M\. Kuriyama 4 Sep: M\. Kuriyama \| 11 Sep: M\. Kuriyama \| 18 Sep: **NO CONCERT** \| 25 Sep: **NO CONCERT** 2 Oct: **Deborah Faul**

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 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/)! 🕊️

Register: https://www.eventbrite.de/e/build-smarter-ai-graphrag-generative-ai-workshop-tickets-1985345958205 Join us for a hands-on introduction to Generative AI with Neo4j at 42 Berlin. **Large language models are powerful — but without structure, they lose context fast.** **As part of the mAI ist für AI series at 42 Berlin, this workshop explores how [Neo4j](https://neo4j.com/ "https://neo4j.com/") can improve GenAI applications and reduce common challenges such as hallucinations.** In this instructor-led workshop, participants will explore how graph databases can improve GenAI applications and reduce common challenges such as hallucinations. You’ll learn key concepts including Large Language Models (LLMs), Retrieval-Augmented Generation (RAG), GraphRAG, vector search, knowledge graphs, and AI agents. The workshop follows a **mixed format, combining short theoretical inputs with practical exercises**. Participants will work through tasks while instructors are available to support and answer questions.

PLEASE NOTE!!! This event will be In-Person for our very 1st Improving collab! If you know the [Columbus Unity group](https://www.meetup.com/columbus-unity-user-group/) location, we'll be at the same place. This is our 1st event and are doing a soft launch with limited attendance. 1st come 1st serve. If you want to be there and we fill up, please email me at [info@thecogg.com](mailto:info@thecogg.com) and I'll be in touch. All street parking is free on Sundays but you can also pay to park in any of the local garages. See image of [parking map here](https://drive.google.com/file/d/1Mr9_LFIggbs-0_Zd3AJTGNqEhgMf2TzQ/view?usp=sharing). \-\-\- On the last Sunday of the month, we're having our usual end-of-the-month social gathering with our GameDev Meetup meeting. There will be announcements and presentations followed by some social networking Let's continue the conversations with good vibes and friends. All are welcomed from all ages and backgrounds to this public event. If we can, we'll be streaming or uploading the video later via our COGG YouTube channel here: [https://www.youtube.com/@TheCOGG/streams](https://www.youtube.com/@TheCOGG/streams) (Also please do subscribe if you have not done so!) No game development experience required! If you are interested in doing a 20 minute game development related presentation, please fill out our form online here: [https://goo.gl/forms/lVdTJZiNJewlPJuj1](https://goo.gl/forms/lVdTJZiNJewlPJuj1) Or e-mail us at info@thecogg.com with the following: Your Name, Company/Affiliation, Name of Your Game/Topic, Description, Tech Needs, and Your Contact. Be sure to check out our Discord for real time news updates: [https://discord.gg/NrBhuNQ](https://discord.gg/NrBhuNQ)

Black Nonbelievers is proud to bring you our 2nd annual Revival of Reason!!! Join us in Atlanta as this year, we will celebrate 15 years as an organization, along with our own version of the Juneteenth holiday! Featured speakers include: – Chris Cameron – Candace Gorham – Kellie King, aka Detroit Atheist Queen – Hemant Mehta, The Friendly Atheist – Godless Engineer – Mandisa Thomas – And MORE!!! This is a family friendly event, so please bring your loved ones, and anyone who is interested in learning and needs secular support. [Sponsorship](https://blacknonbelievers.wufoo.com/forms/revival-of-reason-2026-sponsors-and-exhibitors/) and [volunteer](https://blacknonbelievers.wufoo.com/forms/revival-of-reason-2026-be-a-volunteer/) opportunities are also available. You can also register to view sessions online. Official BN members get a special discount, so [sign up or renew ](https://bit.ly/3DMndSK)today! **We look forward to seeing you at the 2026 Revival of Reason. [Register TODAY!!!](https://bit.ly/RoR2026sitepage)**

**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/

The June Ohio North Database Training user group meeting will be held on **June 2nd, 2026 at 5:00PM**. This will be a **HYBRID** event and we will be joined online by **Sam Nasr.** You're welcome to come meet in-person at our meeting location, the offices of Improving at **[6000 Freedom Square Dr,](https://www.google.com/maps/place/Improving/@41.4004167,-81.6614462,17z/data=!3m2!4b1!5s0x8830e5b8255c5919:0xd8297060eb68fe04!4m6!3m5!1s0x8830dc7a0fe35dc9:0xbfc4710ecadfc5c!8m2!3d41.4004127!4d-81.6588713!16s%2Fg%2F1hm3hkqp3?entry=ttu&g_ep=EgoyMDI1MDQzMC4xIKXMDSoASAFQAw%3D%3D)** **[Unit 110,](https://www.google.com/maps/place/Improving/@41.4004167,-81.6614462,17z/data=!3m2!4b1!5s0x8830e5b8255c5919:0xd8297060eb68fe04!4m6!3m5!1s0x8830dc7a0fe35dc9:0xbfc4710ecadfc5c!8m2!3d41.4004127!4d-81.6588713!16s%2Fg%2F1hm3hkqp3?entry=ttu&g_ep=EgoyMDI1MDQzMC4xIKXMDSoASAFQAw%3D%3D)** **[Independence, OH 44131](https://www.google.com/maps/place/Improving/@41.4004167,-81.6614462,17z/data=!3m2!4b1!5s0x8830e5b8255c5919:0xd8297060eb68fe04!4m6!3m5!1s0x8830dc7a0fe35dc9:0xbfc4710ecadfc5c!8m2!3d41.4004127!4d-81.6588713!16s%2Fg%2F1hm3hkqp3?entry=ttu&g_ep=EgoyMDI1MDQzMC4xIKXMDSoASAFQAw%3D%3D)** [Teams Link ](https://teams.microsoft.com/meet/215625630917731?p=vxNb3zudhNj0S6Cg0v)if anyone needs it after RSVP-ing for in person. If you would like to subscribe to our email list outside of Meetup, we have changed platforms recently and you will need to register [here in Kit ](https://ohio-north-data-training.kit.com/b8f036f615)instead to receive emails. Agenda: **5:00 PM EST**: Online and in-person meeting begins with a social hour. This is an unstructured hour where you can join us to catch up and meet other group members before the session starts. There will be food brought in for in-person attendees. **6:00 PM EST**: Elections, announcements, followed by our feature presentation. See below for presentation details. **7:30 PM EST**: Optionally after the main presentations, the in-person crowd may go out for snacks and drinks at a local establishment. We hope to see you there! Session Abstract ### SQL Server 2025: The Developer’s Revolution Explore SQL Server 2025’s new dev features -JSON type, Regular Expressions, and Change Event Streaming for real-time pipelines. See how REST API and Data API Builder turn your data into secure, high-performance APIs. Packed with demos, this session is perfect for developers, DBAs, and architects \*Please note, that we will be using Microsoft Teams for the online portion of this meeting. You may want to join a few minutes early to ensure you do not have any issues. If you are attending in person, there are large TVs at the office, and you do not need to bring a laptop or use Teams.

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