Here are some ideas:

REI Park Tool Bicycle Maintenance School (search the different stores for different dates)
http://www.rei.com/stores/store_even...ignore_cache=1

REI Cycling Classes
http://www.rei.com/rei/outdoorschool...c_regional.jsp

Bella Fiore
http://www.bicycleemporium.com/index.cfm?pageid=509

Women’s Wednesday Ride
http://www.davisbikeclub.org/