So important stay aware of our vastness......
Spirit Rock Open meditation is every Monday at 7 PM. First time is free, after that it is $8. (They also have dinner before usually).
It is Vipassana so there are minimal religious practices - it is a very friendly place to drop on.
In San Geronimo valley.
http://www.spiritrock.org/Green GulchGreen Gulch Farm Zen Center, also known as the Green Dragon Temple, is a Buddhist practice center in the Japanese Soto Zen tradition. On Sunday, they have a public program, which includes zazen instruction, a lecture, tea, and a public lunch. Instruction is at 8:15 and meditation at 9:15. It is free, though $8 for lunch. It is just before Muir Beach.
http://www.sfzc.org/ggf/display.asp?catid=3,123&pageid=239Shambhala Meditation GroupIt meets in San Rafael on Tuesday nights at 7 PM. Free.
It is a much smaller group than Spirit Rock or Green Gulch.
http://www.tamalpais.shambhala.org/The Yoga Center of MarinThey have meditation classes: Weds 6:30-7:10 AM, Fri 6:30-7:10 AM, Fri 7-8:30 PM, Sun 6-8 PM. Corte Madera
http://www.yogacenterofmarin.com/#meditation