On USACycling.org you can set your profile to your geographic area or state so it'll show you where the local races are.
The USAC site is a better listing for races they issue permits for, of course.
Find out who the promoter in your region is and see their website. Their calendar will tell you what's coming up as USAC and bikereg only know what's been submitted to them (which may not be anything more than one race at a time).
Find your next race:
prerace.com is awesome. I use it all the time when I'm going on trips out of the state and want to see if there are any races I can do. Of course I found it after I spent weeks searching every states race list and it still wasn't complete. Big kudos to the guys at prerace.
Cat 1 o-meter: cowering in fear