The San Mateo County Astronomical society has monthly meetings on the first Friday of most months. Attendance is open to the public and admission and parking are free. The meetings include a social hour with coffee and pizza starting at 7:00pm followed by a talk by an astronomy professional at 8:00pm. For topics and details, see http://www.smcasastro.com/meetings.html
SMCAS holds free telescope viewing events twice a month at Crestview Park in San Carlos. To find out more about these events, go tohttp://www.smcasastro.com/star-parties.html
To find out about Astronomy Events at the College of San Mateo, including Planetarium Shows and special observing events, go to http://collegeofsanmateo.edu/astronomy/announcements.asp.
To receive emails about astronomy lectures and events in the Bay Area, join the BayAstro Yahoo group at https://groups.yahoo.com/neo/groups/bayastro/info.