Have you considered something like a 'GoFundMe.com' campaign to raise funds? Might be a way for people to pledge money but not pay until the full amount is funded (I don't really know how it works).
Springfield might also be an option if you're looking to cut costs. It puts you about a 25 minute drive from NMUSAF in Fairborn. I know there's a little civic center/museum in downtown Spfld which is used for a small wargaming convention each year.
Of course, if people are flying in on commercial flights the Dayton area makes a lot more sense.
--jeff
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