Once a year they hold a Fly In, in conjunction with EAA Chapter 22. This year it is May 6, starting at 7 AM local (CDT).
I have been twice. It is a real blast. In addition to normal ground control, there is breakfast ground control. There are always a huge number of warbirds in attendance.
http://courtesyaircraft.com/DEFAULT%20NEW.htm
http://courtesyaircraft.com/events&.htm