Actually, you know what? I just came up with a GREAT idea.
If you were to sell DVDs with Halo CE maps on it on eBay, you would have no trouble helping set up this convention and then some.

I give you written permission to use my maps for the compilation. I expect partial proceeds in the amount of 1% of each sale. Even with that, you should be able to pay for everything, fly everyone out there, and I'll still be as filthy rich as Scrooge McDuck.

It's a win/win situation.