Charlie,
Contact the show's officials today. Show them what you have. I think that with the right people involved your car could still get there, but they would have to fly it, since the USAF is involved as a major sponsor a MAC hop to Wright Patterson or directly to Lockborne (Rickenbacker) could be arranged if the right officials are contacted.
Today is the meet and greet show starts tomorrow.
I am 25 minutes from the show. Would not miss it for the world. Your car belongs there.
http://www.gml2007.com/