It's mainly a gun show, it's called the Indy 1500.
Lots of good stuff and several forum members are set up there.
It's fast paced, and lots of pre-ban weapons.
If you can't find it at the 1500, you probable can't find it.
Coming from the West on 74 you go North on 465 and get off on the next exit. 38th street, go East around 6-8 miles to the Fair Grounds, follow the signs. Can't miss it.