Mt. Tam Star Parties - Members-only monthly stargazing at the Rock Spring Trailhead on Mt. Tamalpais, from sunset until 2 AM
Observatories
SF State Observatory (Instagram) - Free public viewing nights on the roof of Thornton Hall during the semester. Check Instagram before going, since it closes on cloudy nights.
Chabot Space & Science Center - Free telescope viewing on the Observatory Deck in the Oakland hills, Friday and Saturday nights, weather permitting.
Lick Observatory - University of California research observatory on Mt. Hamilton above San Jose, with a visitor center and summer public programs
Lawrence Hall of Science - UC Berkeley science museum in the Berkeley hills with a planetarium and occasional stargazing events
Stanford KIPAC Telescope Viewings - Public stargazing parties at the Stanford Student Observatory, plus viewings during eclipses and other astronomical events
Dark Sky Places
Zion National Park - International Dark Sky Park in Utah. The NPS page covers where and how to stargaze safely in the park.