What are some ideas for making money at a bar if my organization is throwing the party there?

My organization is trying to host a Halloween Party at a Local Bar. We are gaurenteed to have at least 30 members if not more to come already. Other than making a percent off of the door or the sales at the bar, what are some other ideas for my organization to make some money off of the deal? Also, what is a good or decent percent to get off of the cover and /or bar? All input is appreciated. Thanks

What are some ideas for making money at a bar if my organization is throwing the party there?
Ask your members to donate a gift basket (liquor, Christmas theme, childrens books, etc) and then at the party they can bid on them. Another money make is to sell split club tickets and announce a winner each hour or so. The more they drink the more they'll buy and half the profits are yours.