to play at a neutral field in Chicago and have Georgetown and USF play at a neutral field in Charleston SC. That'd be a long bus ride for Georgetown but probably easier than making flight arrangements this late.
The winners could play Monday night somewhere, maybe in Florida. Given't ND's financial resources, ND could agree to charter a plane to somewhere near Georgetown or USF if ND wins. I'm not sure if Marquette would be willing to make the same commitment.