Japan, Tokyo Weekly Tech Event Digest [`25 Apr 21 - Apr 27]

Hello, tech enthusiasts! Hope you’re having a great week. Here’s a list of upcoming tech events in Japan for the week of April 21 to April 27.

Events

Monday, April 21

• Seminar on Advancing Alignment | 🕐 10:00 | Online | 🇬🇧 | 🔗Link: Huaxiu Yao (University of North Carolina) discusses aligning multimodal foundation models with user preferences. Covers reward models, preference data generation, post-training, self-improvement, and application examples. Open to all online.

• Talk on Diffusion Models | 🕐 11:00 | Online | 🇬🇧 | 🔗Link: Prof. Qing Qu discusses the transition from memorization to generalization in diffusion models as training samples increase. He leverages the low intrinsic dimensionality of image datasets and the low-rank property of the denoising autoencoder to explain this phenomenon. The talk explores the connection between subspaces and semantic representations for efficient image editing and addresses implications for training and model safety.

• BIJ Networking | 🕐 12:00 | Online | 🇬🇧 | 🔗Link: BIJ Networking event on Discord. Informal audio-only hangout to discuss all things Japan. Open to those working, running a business, or curious about the Japanese market.

• GitHub Copilot Meetup 5: Catchup & Handson | 🕐 18:30 | Ly Corporation Hakata Office, Fukuoka | 🇬🇧 | 🔗Link: GitHub Copilot Meetup focusing on recent updates and hands-on workshop. Covers using Copilot extensions and requires a GitHub account, VS Code, and Codespaces or ngrok and Node.js. Speakers from Microsoft include Kaisei Tsujimoto and Ryusei Oya.

• Sendagaya.rb 491 | 🕐 21:00 | Online | 🇯🇵🇬🇧 | 🔗Link: Sendagaya.rb #491, an online event discussing Kaigi on Rails/RubyKaigi 2024 highlights, coding challenges, and exploring various topics. Participants can bring their own projects or choose from suggested topics like Ruby hacking, Rails guides, metaprogramming, and REST architecture. Join the slack community for questions and URL sharing.

Tuesday, April 22

• Tokyo Startup Lunch Club | 🕦 11:30 | Tokyo International Forum | 🇬🇧🇯🇵 | 🔗Link: Casual lunch meetup for startup founders, investors, and enthusiasts to connect and network in an informal setting.

• OrbsCafe 9 | 🕐 19:00 | Gloria Building, Shinjuku City, Tokyo | 🇬🇧🇯🇵 | 🔗Link: OrbsCafe is a networking event focused on Web3. This edition features a guest lecture by SBI VC Trade on next-generation finance. The event includes a lecture from 7:15 PM to 8:00 PM followed by a networking session. Attendees are requested to follow Orbs Japan’s X account.

• JJUG Night Seminar: From Reactive Streams to Virtual Threads | 🕐 19:00 | Microsoft Japan, Tokyo | 🇬🇧 | 🔗Link: A night seminar exploring the differences and features of Reactive Streams and Virtual Threads in Java, with a focus on how to use them effectively and whether they can be combined. The session involves implementing a simple stream library and delves into structured concurrency, backpressure handling, and performance considerations.

• Tokyo HackerSpace Weekly | 🕢 19:30 | HackerSpace, Tokyo | 🇬🇧 | 🔗Link: Weekly gathering for tech enthusiasts, makers, and hackers to collaborate, share ideas, and work on projects together.

• Space Cafe Tokyo: When Stars Collide | 🕐 20:00 | Good Heavens British Bar, Tokyo | 🇬🇧 | 🔗Link: A talk by Albert Sneppen on the formation of atoms in our bodies from colliding stars and the limits of physics in black hole creation. Held at Good Heavens British Bar in Shimokitazawa. Doors open at 7:30 pm, talk starts at 8 pm.

Wednesday, April 23

• Building within Planetary Boundaries | 🕐 09:00 | Umeda South Hall, Osaka | 🇬🇧🇯🇵 | 🔗Link: International symposium on sustainable building design, discussing scales and practices applicable in different building cultures. German, French, and Japanese experts will participate. An exhibition “Material Flows” will follow the symposium.

• YOKOHAMA CONNECT #12 | 🕐 16:00 | Tech Hub Yokohama | 🇬🇧🇯🇵 | 🔗Link: YOKOHAMA CONNÉCT #12, held at Tech Hub Yokohama, offers various sessions, including demo tables, presentations, and roundtables. Topics range from partnerships and sustainability to AI and SDGs. The event welcomes innovators, entrepreneurs, and community members.

• Shibuya Public Event Brunch | 🕕 16:00 | Shibuya Startup Support Space | 🇬🇧🇯🇵 | 🔗Link: Networking brunch hosted by Shibuya Startup Support, providing tools and connections for startups to grow.

• India Startup & Business Ecosystem in Japan Get Together | 🕐 17:00 | Golden Egg Ventures, Tokyo | 🇬🇧 | 🔗Link: Indian entrepreneurs and business leaders gather in Japan to share experiences and explore collaboration opportunities. Discussions on scaling businesses, navigating the Japanese market, and overcoming hurdles. Event includes panels on the Indian startup ecosystem and building global startups from Tokyo.

• AI Salon Tokyo | 🕐 18:00 | Ark Mori Building, Tokyo | 🇬🇧 | 🔗Link: AI Salon Tokyo, a monthly in-person event, brings together AI founders, builders, investors, and partners. This event includes lightning talks from startups, a guest speaker on AI agents, a panel on real-time intelligence, and networking opportunities. The event features various AI companies and initiatives.

• Data Intelligence Tokyo | 🕐 18:00 | Wework Shinagawa, Tokyo | 🇬🇧 | 🔗Link: Data Intelligence Tokyo #14, an international community in Tokyo for business and tech professionals interested in data. Focuses on data strategies and organization, covering DX, data management, governance, platforms, products, and AI governance. Hosted by Quollio Technologies. Lightning talk by Loys Belleguie on AI Agents and Knowledge Graphs. Networking with food and beer.

• Cyber security basic training with Rakuten | 🕐 19:00 | Le Wagon Tokyo - Coding Bootcamp, Tokyo | 🇬🇧 | 🔗Link: This hybrid event offers a simplified approach to Threat Modeling for all skill levels. Learn to think like an attacker, identify and prioritize risks, and build stronger security defenses. The training covers STRIDE and RTMP, requiring a laptop with draw.io access. Led by Nobu Adlizan Ibrahim, a certified Rakuten trainer with extensive cybersecurity experience.

• Tokyo HackerSpace Weekly JP | 🕢 19:30 | HackerSpace, Tokyo | 🇯🇵 | 🔗Link: Weekly gathering for tech enthusiasts, makers, and hackers to collaborate, share ideas, and work on projects together. In Japanese.

Thursday, April 24

• Thursday Gathering | 🕐 16:00 | Cic Tokyo | 🇬🇧🇯🇵 | 🔗Link: Thursday Gathering #334 at CIC Tokyo. Online and in-person participation options. Various sessions offered, including How to Enjoy Thursday Gathering, Women Leaders Arena, and discussions on startups, AI, and CVC in Japan.

• Shopify Store Strategies for Overseas Sales | 🕐 18:30 | Spacemarket Lounge, Tokyo | 🇬🇧🇯🇵 | 🔗Link: Learn strategies for Shopify stores targeting overseas sales. Hear success stories and solutions to cross-border e-commerce challenges, such as marketing, localization, and copywriting. Network with other Shopify owners.

• Shibuya Evening Code | 🕐 18:30 | Starbucks Coffee - Shibuya Modi, Tokyo | 🇬🇧 | 🔗Link: Meetup for coding, web development, design, cloud, and AI enthusiasts. All levels welcome. Bring your laptop, share your work, and connect. Free event, but purchase at the venue is expected.

• Tech Night WeWork | 🕐 18:30 | Wework 青山, Tokyo | 🇬🇧🇯🇵 | 🔗Link: Casual lightning talk event at WeWork Aoyama, sharing latest tech trends and development tips. A chance to hear real experiences, learn new technologies and tools, and connect with others. LTs, networking, and information exchange. Open to engineers, designers, PMs, and tech enthusiasts.

• Tech Networking in Shibuya | 🕐 19:00 | Sam’s Bar Tokyo, Shibuya City | 🇬🇧🇯🇵 | 🔗Link: Connect with IT professionals in Shibuya. Casual networking event for diverse backgrounds, including engineers, executives, and job seekers. Reception starts 18:55. Fee: ¥1000 + 1 drink.

• pixiv App Night | 🕐 19:15 | Online | 🇬🇧🇯🇵 | 🔗Link: Pixiv App Night, hosted by Pixiv Inc., brings mobile app developers together. Two presentations by Pixiv’s Android engineers. Covers Serializable/Parcelable and Edge-to-Edge/WindowInsets. Free online event via Google Meet. April 24, 2025, 7:15 PM.

• Python Boot Camp Online Consultation | 🕐 19:30 | Online | 🇬🇧 | 🔗Link: Online consultation for those interested in Python Boot Camp. Discuss local situations, ask questions, and learn about PyCamp’s activities. PyCamp offers Python tutorials for those unable to attend PyCon JP or lacking local Python communities.

Friday, April 25

• Antler Co-Founder CONNECT | 🕐 17:00 | Fingate Kayaba, Tokyo | 🇬🇧🇯🇵 | 🔗Link: Matchmaking event for entrepreneurs seeking co-founders. Connect with founders from Antler Residency in Japan. Not for sales/recruiting purposes. Photos/videos will be taken for PR.

• Tokyo Game Jam | 🕐 18:30 | Minato City, Tokyo | 🇬🇧🇯🇵 | 🔗Link: Tokyo Game Jam, hosted by Alibaba Cloud and MeltingHack, is a 3-day hackathon for indie game studios and startups. Participants will use Alibaba Cloud’s solutions to create innovative games. Prizes total 1.4 million yen. The event includes networking, prototype development, pitching, and mentorship.

Saturday, April 26

• Digital Nomads Morning Activity | 🕐 09:00 | Dean & Deluca Cafe Tokyo College Of Music, Tokyo | 🇬🇧 | 🔗Link: Morning activity event for digital nomads and expats in Nakameguro. Breakfast, networking, and making new connections. Limited to 25 people. Photos and videos will be taken. Primarily English.

• Marunouchi Morning Code | 🕐 10:00 | Dean & Deluca Marunouchi, Tokyo | 🇬🇧🇯🇵 | 🔗Link: Free meetup for tech enthusiasts interested in code, web development, design, cloud, blockchain, or AI. All levels welcome. Bring your laptop, discuss projects, and share ideas.

• OSS Gate Tokyo Workshop | 🕐 10:30 | Hi Lab@ Reazon Hi Laboratory, Tokyo | 🇯🇵 | 🔗Link: Workshop on contributing to open-source software (OSS). Beginner and supporter participation. Prepare GitHub account. Bring a development-ready computer.

Sunday, April 27

• Developer Personal Project Meetup | 🕐 10:00 | Starbucks Coffee - Shibuya Modi, Tokyo | 🇬🇧🇯🇵 | 🔗Link: International developer meetup in Tokyo. Participants introduce themselves and share projects/portfolios. Discuss improvements, monetization, and job interview prep. Collaborative work or individual efforts. Share insights with the community. Open to all skill levels.

Disclaimer

Events above are collected from a variety of online open sources. There might be changes or cancellations. Please check the event page for the most up-to-date information.

If you have an event to share, please let us know - we’d love to include it in our next digest! Mail us at [email protected].