Why not run your own food and soft drink stands?
Get volunteers to flip burgers and take money for sodas....

Seems to me not rocket science!

Sell things at actual cost. You will not have to bother the venders, manage them. Power is not needed. never was and is an illusion to see it essential to folk performance today, no sound equimpent not necessary and kickbacks surely are not either- tickets not at all stamp hands....and the kicker porta-potties.....

There have been festivals from the earliest of earliest times. Most of that time no one paid for port o pottiess and they did just fine.

You have got to think outside the contemporary scene to lower costs and end the lock out of the thousands who can not get in.

Conrad