- Arts And CraftsPleasanton Art LeagueNonprofit charitable organization serving artists in the Tri-Valley area, with general meetings, workshops, exhibits, an art circuit, and scholarships. Holds joint LAA/PAL general meetings with the Livermore Art Association.
- Music Dance And PerformancePleasanton Community Concert BandVolunteer community concert band performing free concerts around the Tri-Valley, including farmers' markets and the July 4 celebration.
- Social And MeetupsPleasanton Mothers Club (PMC)Social nonprofit for Tri-Valley moms with playgroups, moms' nights out, and an annual Mother's Day Brunch celebrating members.
- Games And TabletopPorsche Club of America - Golden Gate RegionPCA Golden Gate Region, celebrating its 65th anniversary, offers the best Porsche experience California has to offer: social events, motoring trips, autocross, time trials, high performance driver education, and club racing.
- Science Tech And CodingPostgreSQL User Groups - Bay AreaBay Area PostgreSQL user-group coverage, consolidated to avoid separate chapter rows.
- Business And CareerProductTank SFVolunteer-organized product community for product managers, designers, developers, and other product people.
- Books And WritingProject Literacy Book ClubFree book discussion group for adults who are already part of Project Literacy or who are interested in joining.
- Sports Wellness And RecreationQueer Run SFA weekly meet up for queer runners of all skill levels 👟✨
- Outdoors And AdventureRainbow SierransSierra Club activities section for LGBTQ+ people and allies, focused on outings and conservation.
- Science Tech And CodingReact Native San FranciscoDeveloper community for React Native talks, discussions, and hack sessions.
- Books And WritingReading on the Avenue Book ClubYoga for a Healthy Mind and Body. Discover a soothing practice designed for all bodies and all levels. Gentle Yoga invites you to relax, restore, and feel better from the inside out.
- Music Dance And PerformanceRedwood Rainbows Square Dance ClubSquare dance club dancing at Wischemann Hall in Sebastopol, offering learn-to-square-dance classes, club dances, and a Bay Area dance calendar.
- Music Dance And PerformanceRedwood SymphonyRedwood Symphony is an all-volunteer orchestra dedicated to the performance of ambitious, contemporary repertoire as well as the great orchestral classics. Now in its 41st season (2025-26).
- Social And MeetupsRotary Club of FremontOur club members are dedicated people who share a passion for community service and friendship. Becoming a Rotarian connects you with a diverse group who share your drive to give back.
- Volunteering And CausesRotary Club of HealdsburgChartered in 1948, the noon Rotary club of Healdsburg holds weekly meetings with speakers, runs local and international service projects, and funds high school scholarships through its annual Crab Feast fundraiser.
- Volunteering And CausesRotary Club of NapaRotary service club in Napa; 'We meet at the Napa Elk's Club at 12:15 - we look forward to seeing you there!'
- Volunteering And CausesRotary Club of PinoleThe Rotary Club of Pinole is a member of Rotary International.
- Volunteering And CausesRotary Club of San MateoRotary chapter ('Service Above Self') meeting weekly in person, funding scholarships for local students including through its annual Fun Run.
- Volunteering And CausesRotary Club of VacavilleRotary service club bringing together Vacaville business and community leaders; meetings are primarily for members and invited guests, with lunch seating planned in advance.
- Outdoors And AdventureRussian River Fly FishersSanta Rosa fly fishing club with monthly meetings featuring speakers and raffles, casting clinics, fishouts, and conservation work; meetings open to visitors and Zoomed to members.
- Science Tech And CodingRust Bay AreaBay Area community for Rustaceans and people interested in the Rust programming language.
- Outdoors And AdventureSailing Education AdventuresLocated in San Rafael, Sailing Education Adventures (SEA) is the Bay Area’s premier non-profit community-sailing organization and has been delivering quality sailing education for over forty years.
- Social And MeetupsSalty Dog Club SFSalty Dog Club is San Francisco’s most comprehensive pet care facility. We offer dog daycare, boarding, training, grooming, and retail services all under one roof.
- Science Tech And CodingSan Bruno Amateur Radio ClubAmateur radio club serving San Bruno and the Peninsula.
- Science Tech And CodingSan Francisco Amateur Radio ClubA community for ham radio enthusiasts that focuses on technical education, public service, and emergency communications.