What area of the state are you in. I know that the CIB here in indy will allow fund raising at the events in Lucas Oil Stadium, if you want to work at a consession stand more people, and work, but more money, or some of the beer portals, less people, less work, but not as much cash. We ran a consession stand one year, but it took about 15 people at each event. The beer portals only required 3-4 people, and we found out that beer drinkers tip more then food eaters.
You might try a golf outting, Find a nice course near you, talk to them about donating some time for this, and sell foursomes for $ 200- 300 apiece, plus 50/50 pots, selling tickets to closest to the pin, longest putt, those sorts of things. You can sell mulligans, and maybe a grass skirt for one of the guys on the team to wear and allow him to hit from the ladies tee. All sorts of things will work, the only limit is your imagination on how to get the cash from the golfers pockets, to the clubs account in a fun and interesting manner.