I posted this in another thread, but think it is more relevant here...
This may be a silly question, but why not move it outside onto one of the fields? You could set up a concert-like stage with appropriate coverage in case of rain. If it rains, spectators can buy a poncho with Mickey or Minnie on the back. The holding areas could be a series of climate-controlled tents so the competitors don't have to deal with the elements. If it is hurricane-like conditions, or the forecast is just plain miserable, move it back inside.
Let's hear why it would be a bad move to have it outside.