theres a ride that leaves casa larios in sunset place on saturdays around 7 am. you should be able to hang with that group. the ride is 60-65 miles round trip. Aso sign up on for the mailing list here
http://www.elitecycling.net/ they have a ride one saturday a month that isn't very hard but is good group riding experience and about 40 miles round trip. pm me with any more questions.
these aren't races though, just group rides.