High School Graduation Party/Open House on a Budget!?

My son is graduating in May on a Sunday, and I would like to throw a open house/party....he's insisting that you have to provide a meal, I thought a cake and punch but want him to be happy....I have a $150.00 budget which doesn't go to far...does anyone have ideas on what kind of food would feed a lot of... show more My son is graduating in May on a Sunday, and I would like to throw a open house/party....he's insisting that you have to provide a meal, I thought a cake and punch but want him to be happy....I have a $150.00 budget which doesn't go to far...does anyone have ideas on what kind of food would feed a lot of people without costing a fortune. Any comments appreciated.
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