Hi Christine! Welcome to Northern CA. Definitely check out the Velo Girls ride calendar:

http://www.velogirls.com/calendar.php

You might also be interested in our email group:

http://www.yahoogroups.com/group/velogirls

We have 1,600 women cyclists from Northern CA on the email group and it's a great resource and a good way to find riding partners.

Lorri