Localendar.com offers free calendars for posting community events.  Other people can search your events by zip code, if you choose to make your events public.

Bay Area Community Events

    E-mail favorite Bay Area community events, or add/edit events yourself to the Bay Area Community Events Calendar:
    (1) Click on the Localendar.com website
    (2) Sign On ID is "SBC-BayAreaEvents"
    (3) Password is "danceforever" - NEW! no space between words