There are many ways to get involved with astronomy here in San Francisco, or wherever you may be. A great resource for finding events in your neighborhood is the Night Sky Network, a resource chock-full of information from astronomy clubs across the United States. Just enter your location and you can find out what is happening in your area.
Here in San Francisco, the California Academy of Sciences has an astronomy lecture series called the Benjamin Dean Lecture Series. The next lecture in the series will be on Monday December 7th. The topic is Saturn, presented by Dr. Carolyn Porco, the director of the imaging team for the Cassini spacecraft that is orbiting Saturn. You can get tickets for the December 7th Dean Lecture online.
The San Francisco Amateur Astronomers (SFAA) have their monthly meeting at the Randall Museum on December 17th and their "City Star Party" on December 26th at Land's End in San Francisco. The City Star Party on the 26th (weather permitting) will be a great chance to bring out new holiday gifts such as telescopes and binoculars and learn to use them alongside amateur astronomers. The SFAA and the San Francisco Sidewalk Astronomers have free telescope workshops before each City Star Party but please RSVP to them at firstname.lastname@example.org if you plan to come on December 26th.
I hope to see you at an upcoming event!