Re: Off-Roading Areas Website - DC
Check out Big Dogs Offroad for events at the Cove Campground in Gore, VA.
Novajeepers is a club in the area you could join.
I think there are trails at George Washington National Forest, but I've never been.
Oak Ridge is a spot down near Charlottesville that sometimes opens it land up for events, but they are maybe 1-2 a year.
2014 JGC Summit