If the game is moved to a school in the same sectional, then the gate goes into the same pot. If the school that the game is moved to is not in that sectional, I am guessing they do not get any of the gate. Concessions are something AD's work together to decide. If the host school puts people in them to work, then that school gets a cut of the concessions. But yeah, that is where the biggest hit in the pocketbook would come for a school that has to move a game. I would venture to guess that if a school chooses to be an alternate site for a game and is not in the same sectional, they would likely want to keep a larger chunk of the concession money.