I am going, I live about 25 minutes away in greenwood.
As for hotels, most people stay in Plainfield just off of I70. There is a conglomeration of hotels within a quarter mile radius. There is at least one hotel I know of just north in Avon a little closer to the track, but it is likely fully as well. You could look just north in Brownsburg, there is one just off the exit ramp behind steak n shake, and another just south of the interstate behind wal-mart. Probably full as well, but worth a shot. I do not remember the names of them, I work on that "west" side of town primarily but I don't pay too close attention to the hotel names.