Saturday begins with Physical AI Hack World Tour - SF. Presented by Founders, Inc. Events and hosted by Ryan Chan, Isaac, Grace Zhang, Logan Garcia, and Mike Shin, this event runs from 9 AM on Saturday to midnight in San Francisco. This is one of the major weekend build events, and it connects directly to the physical AI theme called out in the post. Check it out on Luma if you want to spend Saturday building around physical AI. Next is MeDo Vibe Coding AI Hackathon: Silicon Valley. Presented by AI Builders and hosted by AI Builders, Beta University, MeDo, Butterbase Events, and Beta Fund, this runs from 10 AM to 6 PM PDT in Palo Alto. The event is framed as a vibe coding AI hackathon, which makes the format clear and hands-on. Go find it on Luma if you want a Saturday hackathon in Palo Alto. Also at 10 AM is San Francisco, CA - Climate Reality Local Training Event. Presented by Climate Reality Local Training Events and hosted by The Climate Reality Project, Harriet Harvey-Horn, and Mary Dube, this runs from 10 AM to 4 PM PDT in San Francisco. This brings climate training into a week that otherwise leans heavily toward AI and founder programming. Look it up on Luma if climate training is part of your work or curiosity. SF Founders Badminton is another Saturday morning event. Presented by Smallest Events and hosted by Lily Yang and Team Sprinto, this runs from 10 AM to noon PDT in South San Francisco. This is exactly the kind of unusual founder format that stands out because people are meeting over badminton rather than a standard panel or mixer. Check it out on Luma if you want to meet founders while actually moving. Open Source Computer Use Hackathon also starts at 10 AM. Presented by Tzafon and hosted by simon, Montana Showalter, and Catherine Jue, this event runs from 10 AM to 4:30 PM PDT in San Francisco. The focus is open source computer use, and it is one of the hackathons driving the weekend programming layer this week. Find it on Luma if you want a Saturday build session with an open source angle. Later in the day is Build Smth AI-Native Hackathon at Cal. Hosted by Aria Chen, Naichuan Zhang, and Sahar Mor of Bond AI, this event runs from 2:30 PM to 8:30 PM PDT in Berkeley. This is a Berkeley-based AI-native hackathon for people who want to spend Saturday building. Look it up on Luma if you want another weekend option outside San Francisco. Saturday closes with DREAM MODELS. Presented by Gray Area and hosted by Gray Area and Rina Nicolae, this runs from 6:30 PM to 9 PM PDT in San Francisco. This adds an art and culture note to the Saturday lineup. Check it out on Luma if you want an evening event outside the standard technical format.