There is an open house at the Dekalb County Airport just down the road a couple of miles.
The terminal will be open for tours and there will be a bomb drop contest @ 3PM (planes flying over trying to drop a water balloon or other innocuous object on a target on the ground) and a hot air balloon launch between 6 and 7 PM.
The Hoosier Air Museum will be open with FREE admission. There will be BBQ dinners (via Timmy's BBQ) for $7. They have a number of old airplanes in their facility and I expect a potential for others to fly in and be parked on the ramp/tarmac.
Directions to the Terminal
Directions to Hoosier Air Museum