The AMA had one in New Smyrna (south of Daytona, FL) last year during bike week. It was for Bike Week. The bike turnout was good, but hardly any quads showed up. I'm not sure if they're doing it again? Maybe contact the AMA and ask them? I know a pro bike guy supposedly crashed there last year and is paralyzed now.
We have a track in the town I live in, but they're down with quads racing at their facility.