Well there is booster clubs! As long as it isnt being used to support athletics, now this is where we would need a lawyer, but booster clubs that can help for activities outside of Cajun Field, that can help out with activiites that are happening outside of Cajun Field. As long as that booster club is not directly giving money to athletics. this could be used to help setup the tents and vendors outside before the game, but a lawyer on this subject would have to be consulted. Volunteers could be used.
The booster club could be funded through private money which would be used to help setup, just as long as the booster is not directly involved with giving money to the athletic department, but everything being sold outside would be for athletics. That wouldnt support the booster or the booster giving directly to athletics.
Could be wrong though!