What have you found is more reasonable, an open bar or a consumption bar? We will be having appx. 60 guests 15 are children so 45 will be of drinking age. Some are heavy drinkers and very few of them are light drinkers. Im guessing the light drinkers will have one drink. My thinking is its Vegas, no one has to drive so they will consume more alcohol. I know I'm aways off, but I'm trying to get an idea budget wise so I know how much OT I have to work