The annual Indy Motorcycle Expo is February 25 -27, 2011. Check the schedule here:
http://www.indianamotorcycleexpo.com/It's usually a decent show and it's part of the 57th Annual Indianapolis Boat, Sport & Travel Show, which is not bad if you're into outdoors stuff involving water or hunting.
The Indy Vinmoto group will have a dozen or more vintage bikes of various makes on display at the east end. I won't have any Bridgestones there this year, though.