I'm having a party with about 70 people. How many full trays of food do I need in the chaffing dishes? I have 6 chaffing dishes set up with 2 half trays in each and need to know how many trays of each dish I have to make. I'm serving: chicken marsala, flounder francese, beef brisket, penne vodka, broccoli, and potato with onion & parsnip. I'm also making a lot of appetizers and dips.