Catering a dessert buffet... for 250 people

I was asked/sort of accidentally offered to cater a dessert buffet for 250 people (with a possible repeat performance the following night for another 250). This will take place in the lobby of a performing arts center, after a concert. So no one is expecting a lot of food, but how in the world do I estimate how much to bake for 250 people? I have requested some catering books from the Library, but they haven't arrived yet and I'm getting anxious. So I appeal to the general wisom. What do you all think?

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