FINDING RACES
Go here:
http://www.usacycling.org/events/index.php?race=Road
Click on the State you want to race in. Note that only USCF permitted races are listed.
If you want to go to your state's homepage (sometimes some other races are listed; e.g., in Michigan the Ontario races are sometimes listed):
http://www.usacycling.org/la/
Some of the states are combined, e.g., Mid-Atlantic (MABRA), Carolinas, New England...