The wonders of the 'net . . . .

http://www.bikecal.com/index.asp
http://www.active.com/
http://www.chicovelo.org/
http://www.sacbike.org/sacbiking/
http://www.saccycle.com/clubs.htm
http://www.bbcnet.com/RideCalendar/RideListDate.asp
http://www.cyclecalifornia.com/Week_ahead.html