SF Social Club - Sept 28th, 2025

Your backstage pass to SF's top tech & startup events this week

Author

Matthew Taksa
September 28, 2025

Happy Sunday, SF Social Club! With SF Tech Week next week, the city is buzzing with anticipation. Luckily, there’s some great networking events and hackathons this week if you’re looking to meet new people sooner.

SF Social Club is brought to you by Matthew (CEO at Caladan) and Jessie (Angel Investor). Since late 2022, we’ve hosted over 100 tech events in San Francisco and built a community of 10,000+ people along the way. Why? Because we’ve seen firsthand that the city feels most alive when founders, engineers, and dreamers come together in person. SF Social Club is our way of curating the city’s best events and hosting our own community mixers, so everyone can find their tribe. If you’re interested in being a sponsor, please fill out this form!

Startup of the Week

Afino is your AI-powered, Slack-connected finance team—offering bookkeeping, tax prep, R&D credits, and fractional CFO support, all tailored for startup speed.

If you’re a founder trying to actually get your finances in order, this one’s for you.

We've partnered with Afino to give one year of corporate taxes for FREE to the first 5 companies that claim this offer.

Event Lineup 🍾

Time: 5:30pm - 8pm

Hosted by Descope in San Francisco

​​​👋 Welcome to our monthly SF meetup!

​​​❤️ Whether you're a developer, founder, or simply curious about the future of AI, you won't want to miss these insightful talks and community demos from leading experts in the field.

Time: 6pm - 9pm

Hosted by Fin in San Francisco

Join leaders from Fin and Figma for an evening of big ideas and practical insights on building products for an AI-driven world.

​We’ll discuss how established SaaS teams are adopting AI in their own processes, and shipping AI products that cut through the hype and deliver real customer value.

Oct 1st, 2025 - Hack Night at GitHub

Time: 4:45pm - 9pm

Hosted by Weaviate in San Francisco

​​​​What will you build with RAG, AI, Agents, MCPs, Agentic RAG, Document Parsing, AI Analysis?

​​​​​​Get ready for an exciting evening of hacking, networking, and innovation! Hosted at GitHub, Presented by Weaviate, this event is all about exploring the potential of AI and creating impactful solutions alongside fellow developers.

Time: 6pm - 8:30pm

Hosted by Tavus in San Francisco

Join us for San Francisco's official meet up for AI Builders at the intersection of people and artificial intelligence. We bring together founders, engineers, designers, researchers, and curious minds building the next wave of human-AI interaction.

Join the top minds in discussing the evolution of conversational AI, building effective and actually useful agents, and what the next interface will look like.

Oct 1st, 2025 - Bun 1.3 Launch Party

Time: 7:30pm - 10:30pm

Hosted by Bun in San Francisco

Celebrate the release of Bun 1.3 with the team and community in SoMa.

​Enjoy bar service (alcoholic and zero-proof drinks), tasty appetizers, and a DJ set from our resident Alistair. Come hang out, swap ideas, and meet other builders. 21+ only.

Time: 4:30pm - 6:30pm

Hosted by FPV Ventures in San Francisco

​Michael Grinich had built something everyone loved at his first startup. Users at NASA, Uber, and Facebook were all using it. There was just one problem: no enterprise would actually pay for it.

​That painful lesson became the foundation for WorkOS. Today they're the backbone that helps companies like Vercel, Webflow, Loom, and Perplexity sell to the Fortune 500. But getting there? That's a different story entirely.

Time: 5:30pm - 7:30pm

Hosted by Notion in San Francisco

​Notion will show how they built AI-powered search across millions of workspaces. Cursor will explain how they make code context actually work. turbopuffer will discuss the infrastructure challenges of serving semantic search at scale.

Real production gotchas, architecture decisions, lessons learned from billions of queries and petabytes stored.

Time: 5:30pm - 8:30pm

Hosted by NVIDIA in San Francisco

​🚀 Unlock the Future of Inference at Scale

​Join us for an evening of cutting-edge insights into the strategies, frameworks, and breakthroughs that are making inference faster, more efficient, and production-ready. Hear directly from experts pushing the limits of distributed AI, open-source innovation, and next-gen optimization—and connect with the community shaping what’s next.

Oct 2nd, 2025 - VapiCon After Party

Time: 6:30pm - 8:30pm

Hosted by Vapi in San Francisco

​The conference doesn’t end when the talks wrap up. We’re taking the celebration to the top of the LinkedIn Tower in the SVB space for the official VapiCon after-party.

​Catch up with friends you met during the day or strike up new conversations over finger foods and drinks—whether you’re going for a cocktail or a zero-proof option, the bar’s got you covered.

Time: 6pm - 9pm

Hosted by WorkOS in San Francisco

​Love APIs and dev tools? Building something cool with AI?

​Come eat tacos, have a drink, and meet new folks! 🚀

​Hosted by your friends at WorkOS. 💙

Time: 9am - 7pm

Hosted by Burning Heroes in San Francisco

​​Burn Your Code is a one-day hackathon inspired by the spirit of Burning Man. Just like art, this is about creation as self-expression. Come build whether it’s a new feature for your current project or a fresh side idea you’ve been dreaming about.

You’ll be surrounded by a supportive community, mentors to guide you, and fueled by delicious Slavic food: crepes, plov, pirozhki and veggies.

Oct 4th, 2025 - NASA Space Apps Mountain View Hackathon

Time: 9am - 5pm

Hosted by International Space Alliance in Mountain View

​​​​Join us for an inspiring weekend where science, art, data, and imagination converge! Mountain View is once again partnering with NASA Ames Research Center to host the NASA International Space Apps Challenge 2025, under the new theme: "Learn, Launch, Lead."

Time: 9:30am - 6:30pm

Hosted by Supabase in San Francisco

Come hack with us! Join the Supabase team the day after Supabase Select for an all-day hackathon with great prizes, great food, and a great vibe.

​Thank you to our sponsors, Figma and Resend.

Oct 5th, 2025 - Cafe Cursor @ Stanford

Time: 8pm - 12am

Hosted by Cursor in Stanford

​Come hang out at On Call Café with Cursor, enjoy a Cursor-themed coffee (available only at Cursor Cafes), and meet others using Cursor on campus!

That’s it for this week!

Thanks for reading this week’s edition of SF Social Club. Have an event you’d like featured next week? Please shoot me an email at [email protected] to get it featured.

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