S.M.
I have never done a fundraiser for a school, but I work in the fundraising field and have done several for my theatre company. You might check on restaurants in the area which might be willing to give you 10% of the business for a special evening benefiting the school. Somewhere attractive to families, but not a chain. You can incorporate a 50/50 raffle to any event, meaning that people buy tickets and 50% of the proceeds go to the school and 50% go back to the winner. Be warned that events are very time consuming and often cost more than they are worth, but people really like them. A raffle might be fun too - you never know what your local businesses will donate just for the free ad space, even in this economy. But if you do a raffle you will need a license, which you can get from the city. As a kid I remember doing dance a thons - that was fun!
Good Luck~