For those "last minute decision makers" like myself; I booked last night at America's Best Value inn in Franklin. about 30 or so miles from the course.
As a spectator, I can let the racers have the close in rooms, and I can drive a little bit without a problem.
There are also other properties in the area; the Knight's Inn in Xenia was reasonable, but I kept getting popups about bedbugs.
Good Luck,
Jim