- Science Tech And CodingMount Diablo Astronomical SocietyM.D.A.S. was formed in 1957 as part of the National Moonwatch program. The club holds monthly meetings in Walnut Creek plus free public and society astronomy programs and star parties (March-October) on Mt. Diablo.
- Arts And CraftsMt. Tam Quilt GuildThe Mt. Tam Quilt Guild promotes an interest in and appreciation of the art of quilt making, to share quilting information and education. Members make quilts and pillowcases for Marin non-profits.
- Sports Wellness And RecreationMuni Run ClubRunning the hills and streets of San Francisco. Saturdays at 8am. All paces welcome.
- Social And MeetupsMutual Feelings SFWe're dedicated to curating inclusive, empowering, and safe community spaces + events for Black women in San Francisco. Mutual Feelings SF invites you to embrace the spirit of the season by honoring the Black Women who inspire, uplift, and bloom in their own unique ways.
- Books And WritingMystery Book Club at Weekes Branch LibraryWe read a mix of cozy mysteries, thrillers. Copies are available on a first come first served basis.
- Books And WritingMystery Writers of America - NorCal ChapterNorthern California chapter of the Mystery Writers of America for mystery/crime writers and publishing community.
- Business And CareerNAAAP San Francisco Bay AreaAsian American professional association chapter with networking, leadership, and community programming.
- Books And WritingNapa County Historical SocietyDedicated to Napa County history since 1948, the Napa County Historical Society is the region's leading source for historic exhibits, presentations, lectures, advocacy, and research, operating a museum and research library in the Goodman Library building downtown.
- Nature Gardens And FarmsNapa-Solano Audubon SocietyAudubon chapter for Napa and Solano counties offering birding field trips, weekly Saturday bird walks, a monthly speaker series, K-12 education programs, citizen science, and conservation advocacy.
- Games And TabletopNapa Valley Model Railroad Historical SocietyModel railroad historical society with a STEM education focus, participating in regional model railroad events.
- Arts And CraftsNapa Valley QuiltersQuilt guild that invites area residents and guests to join; meets monthly at the Napa Senior Citizens Center. Mailing address P.O. Box 405, Napa, CA 94559.
- Culture And LanguageNepali Association of Northern California (NANC)Preserving Nepali Culture, Uniting Communities
- Social And MeetupsNewcomers' Club of San Mateo CountyA 501(c)3 non-profit social group for all San Mateo County residents, founded by Ida Lindau in 1949 as the San Mateo Newcomer's Club and renamed in 1998.
- Sports Wellness And RecreationNike Berkeley Run ClubBranded run club
- Social And MeetupsNiles Rotary Club of FremontA group of business and civic-minded individuals and leaders being the change we want to see in Fremont and the world.
- Sports Wellness And RecreationNob Hill Run Club3 mile runs, Saturdays in Marina Green, check out linktree for deets!!! all paces & beginner runners are welcome
- Books And WritingNoname Book Club - Oakland ChapterReading material for the homies
- Sports Wellness And RecreationNon-Binary Run Club SFnon-binary run club is celebrating, uplifting, and providing a training community for trans and non-binary runners.
- Sports Wellness And RecreationNor Cal AquaticsA fun social masters swim group for all ages and abilities; some swimmers compete in pool and open water events; triathletes, beginners, and fitness swimmers welcome. Trains at Health Quest Fitness in Napa and Lake Berryessa.
- Sports Wellness And RecreationNorth Bay AquaticsOffering practice 7 days a week, NBA serves the North Bay for swimmers looking for coached practices while having a lot of fun, from beginning to highly competitive levels.
- Outdoors And AdventureNorth Bay Rowing ClubRowing club in Sonoma County offering junior crew (middle school learn-to-row and high school competitive teams), adult programs, and summer camps on the Petaluma River.
- Culture And LanguageNorwegian Club of San FranciscoPrivate nonprofit organization promoting fellowship among the Norwegian-American community in the San Francisco Bay Area.
- Social And MeetupsNovato Mothers ClubCreated in 1993 to provide mothers with a supportive nurturing environment, knowledge through shared experiences, friendship, and activities; members enjoy playgroups, family events, moms' nights out, and a quarterly newsletter.
- Outdoors And AdventureNo Worries Amigo Hiking ClubBay Area hiking club/community focused on organized hikes and social outdoor connection.
- Business And CareerNSBE San Francisco Bay Area ProfessionalsProfessional chapter for Black engineers and technologists with networking, programs, and community activities.