Lego Groups San Francisco

🚀 Build Your Own Ping Pong Ball Launcher (CHM)

**Ready... aim... launch!** Build an exciting Arduino-powered ping-pong ball launcher using two motors and simple electronics. Learn how to wire components, program an Arduino, and see how flywheel launchers work as you create a fun project from start to finish. Perfect for beginners with no programming experience required! **If you have a laptop, please bring it — but come anyway if you don’t!**

Gambier Plaza & Lego Garden Cleanup

Meet at [Burrows St & Gambier St](https://www.google.com/maps/place/Burrows+St+%26+Gambier+St,+San+Francisco,+CA+94134/@37.7244591,-122.4208821,17z/data=!3m1!4b1!4m6!3m5!1s0x808f7ef27b794009:0x5e1ecd825eb98225!8m2!3d37.7244591!4d-122.4208821!16s%2Fg%2F11h9_gdygx?entry=ttu&g_ep=EgoyMDI1MDUwMy4wIKXMDSoASAFQAw%3D%3D "https://www.google.com/maps/place/Burrows+St+%26+Gambier+St,+San+Francisco,+CA+94134/@37.7244591,-122.4208821,17z/data=!3m1!4b1!4m6!3m5!1s0x808f7ef27b794009:0x5e1ecd825eb98225!8m2!3d37.7244591!4d-122.4208821!16s%2Fg%2F11h9_gdygx?entry=ttu&g_ep=EgoyMDI1MDUwMy4wIKXMDSoASAFQAw%3D%3D") to grab our supplies and form our crew. Then, cleaning & gardening will occur from 9:00am to 12:00pm around the neighborhood and park. Sign up on Meetup, this [Civic Joy Fund Mobilize](https://www.mobilize.us/civicjoyfund/event/786624/) page or email info@refuserefusesf.org with event name. \*By participating or registering in a cleanup or volunteer event, I acknowledge and agree to the Civic Joy Fund and Refuse Refuse volunteer waivers: [https://civicjoyfund.org/volunteer](https://civicjoyfund.org/volunteer) - [https://refuserefusesf.org/waiver](https://refuserefusesf.org/waiver)

Free Jigsaw Puzzle Night @ Ace Makerspace

Join us for our next FREE puzzle night! This event meets in Suite #206, co-working. Attendees are welcome to bring snacks and drinks to share. At previous events we've finished one \~1000-piece puzzle in about 3-4 hours. Your hosts (Pixie and Jacky) will be providing a few puzzle options for this next event. Check the #coworking channel a week or so before the event to vote on our next puzzle. New Guests must [sign up for a FREE Guest Account and sign their liability waiver](https://www.acemakerspace.org/product/guest-account/) before this event starts. Add the FREE account on the Ace makerspace website check out or sign up here → [FREE Guest Account](https://www.acemakerspace.org/product/guest-account/) Ace Makerspace is a 501(c)(3) non-­profit member-supported organization. All proceeds support Ace Makerspace and help us serve over 1200 people a year with innovative programs, equitable access to makerspace resources, and more creative, self-reliant communities in Oakland. YOU MUST RSVP/PURCHASE TICKETS THROUGH THE ACE MAKERSPACE WEBSITE: [www.acemakerspace.org/calendar](https://www.acemakerspace.org/calendar/)

Bachata Night @ allegro

Strictly Island vibes Bachata room with some Salsa Most of you are missing the island rhythm. Tonight, we'll take you to the classics as well as modern dominican music! 830pm - Dominican Bachata Partnering 930pm - Socials with DJ Ron $15 at the door with Free Dance Lessons

Fortress Mode: Arduino Motion Gates (CHM)

Step into engineer mode and build your own automatic security gate using an Arduino, a motion sensor, and a servo motor! In this hands-on class, you’ll create a mini “fortress gate” that springs open whenever someone approaches. Along the way, you’ll learn: * How motion sensors detect movement * How servo motors create controlled motion * Basic Arduino programming and wiring * How real-world smart security systems work By the end of the class, you’ll have a working motion-activated gate and the skills to customize it with lights, alarms, or secret fortress upgrades. No experience needed — just bring your curiosity and prepare to defend the kingdom. 🏰🤖 **If you have a laptop, please bring it — but come anyway if you don’t!**

Hike: San Diego River Gorge Trail

Hi group, Adding this hike route for the group: 🥾 San Diego River Gorge Trail 📏 5.6 mi ⏱ ~2 h 47 min I'd love to organise a self-hosted meet to do this hike together on Friday, July 24. No commercial host, just members of the group meeting up to enjoy the route. Bring water, weather-appropriate gear, and the route loaded on your komoot app: https://www.komoot.com/smarttour/e1217546419/san-diego-river-gorge-trail Hope to see some of you there.

Oakland United Beerworks!

PickleFun in San Francisco 🥒🎾🎉🎉

* Join us for a fun time of playing and drilling pickleball COACH HUY LE! * Check us out on Instagram [p1ckl3fun](https://www.instagram.com/p1ckl3fun?igsh=NTc4MTIwNjQ2YQ%3D%3D&utm_source=qr) * This event is perfect for pickleball enthusiasts at the **Intermediate Level (3.5+)** who want to improve their game. * We reserved the right to refuse to service. * Come enjoy some friendly competition and make new friends in the process. Bring your paddles, wear comfortable clothes, and be prepared for a great time! * **Location:** Buena Vista Park Northwest Entrance, Haight Street, San Francisco, CA * **Safety Disclaimer:**
The organizers of this meet-up are unpaid volunteers. All participants agree to assume 100% responsibility for their own safety, conduct, and well-being and recognize that possible hazards exist while participating in outdoor (or any other) activities, and agree to participate solely at their own risk. If you RSVP “Yes” and/or attend any of our events, it shall be conclusively presumed that you understand and agree to this policy

Spec-Driven Development: The Rise of Builder PMs

**Code got cheap. Clarity hasn't.** AI coding agents can now build almost anything you describe. The old bottle neck of writing code is gone. The new one is saying what to build clearly enough that an agent builds the right thing. This is the shift behind spec-driven development. Instead of prompting an agent and hoping, teams write a spec first: the behavior, the constraints, and what "good" looks like. The agent builds against it. In a world of disposable code, a long-lived spec becomes the artifact that matters most. Product managers have always turned ambiguity into something a team can ship. The PRD is used to align people. The **spec** **aligns** **people** ***and*** **agents**. This is the rise of the **Builder PM**: a product leader whose judgment is precise enough to direct a fleet of agents. Join ProductTank SF and Workato for a panel on spec-driven development and how it works inside real teams. **Key Takeaways** * How **spec-driven development** works * Why the PM role changes when **clarity** is **scarcer** than **code** * **PRD → Spec** and what that means for how you write requirements **The Panelists** * **Chris Butler** is Director of Product Operations on GitHub's Synapse team, where he leads experimentation in AI-powered process automation. He has held product roles at Microsoft, Waze, KAYAK, and Facebook Reality Labs. * **Swetha Sridharan** is a Principal Product Manager at Workato, the automation and integration platform. She builds AI-driven products that orchestrate work across an organization's apps, data, and agents. * **Albert Collell** is a Senior AI Product Leader at Qurrent and teaches product management at Stanford. He uses AI to raise decision quality and turn complexity into clarity at scale. **Special Thanks to our Generous Sponsor** **Workato**: the AI-powered automation and integration platform that lets teams orchestrate work across their apps, data, and agents. Thank you to Workato for hosting us and providing food and drinks. *Attendance will be first-come, first-served. We will close doors once we reach capacity; arrive early to secure a spot.*

Sandbox Socials: A VR Experience (IRL Party)

*NOTE: Tickets for this date are not yet available. Do not buy a ticket prematurely or you will be buying a ticket for the wrong date.* Welcome to an IRL party filled with VR experiences. For only $20, your purchase includes entry, one free VR experience, and one free food menu item at Sandbox VR Emeryville. Drinks sold separately. The events typically run from 7:00 PM to 11:30 PM, featuring live music, exclusive team prizes, and the chance to compete against other groups. It’s a great way to mingle, enjoy themed bites, and try out popular VR worlds like *Stranger Things* and *Squid Games*. Reserve tickets for the specified date as early as possible when they become available, spaces are limited.

Thursday Casual Clay Night

Looking to get your hands dirty on a Thursday night with some pottery? Pre-register and bring your friends for our Casual Clay evening. Acceptable from beginners that just want to try working with clay to more experienced potters wanting to hand build. Email clay@stickyartlab.com to register. UPDATED PRICING FOR 2026: Pricing is $40 for the first person, and $35 for each additional person in your group. This includes the firing fee and second session to glaze your pieces. Space is limited, so reserve your spot today!

Ace Maker Social

Connect with other makers in the community at this ***FREE*** **Monthly Ace Maker Social.** This event is open to the public. **Everyone is invited!** There will be open ended conversation, knowledge sharing, light refreshments and more. These maker socials will occur monthly and feature special guest presentations, demos, or activities to foster community engagement and collaboration cross the various programs, tools and spaces at Ace Makerspace. New Guests must [sign up for a FREE Guest Account and sign their liability waiver](https://www.acemakerspace.org/product/guest-account/) before this event starts. Add the FREE account on the Ace makerspace website check out or sign up here → [FREE Guest Account](https://www.acemakerspace.org/product/guest-account/). Ace Makerspace is a 501(c)(3) nonprofit member-supported organization. All proceeds support Ace Makerspace and help us serve over 1200 people a year with innovative programs, equitable access to makerspace resources, and more creative, self-reliant communities in Oakland. YOU MUST RSVP/PURCHASE TICKETS THROUGH THE ACE MAKERSPACE WEBSITE: [www.acemakerspace.org/calendar](https://www.acemakerspace.org/calendar/)