Held at the State Fairgrounds. Great for all types of advertising. Some petro (check BOTW) (I'm told it's not like it used to be). Still considered the best ad show in the country with dealers from both coast represented. Peotone is far better for petro items. It was last weekend. Next show in March.
I went to the Indy ad show a couple years ago. It was pretty good. The one I went to seemed a little small than I thought it would be but still had a pretty good time. Saw plenty of stuff I liked.