How much money will I get from my 16th birthday party? HELP?

So, I am having a rather big 16th birthday party. It will be at a banquet hall with about 80-100 people. Lots of food, expesive decorations, bar etc. Packages are like $40+ per person. How much money should each person or family give me, being that it is a rather elaborate party, almost a wedding feel. Thanks