It's been around the Great Lakes for a long time - CORR put on some of the best short course racing every year in Crandon Wisconsin over Labor Day and Memorial Day weekends. CORR is gone now; LOORRS is running West Coast, but in the east, you'll find great action with the TORC series.
Traxxas TORC - THE Off Road Championship
Two more are on the schedule in that area this season:
August 8-9 Bark River Intl Raceway, Bark River, MI
Sept 4-6 Crandon Intl Raceway, Crandon, WI
Farther your way though, you'll have to dig a big more. Some Regional and local stuff?
East Coast Short Course Racing? 
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