Buffet ... salads such as potato salad, coleslaw, tuna and pasta, rice salad, cous cous salad, mixed leaves. Then cold meat, quiche, scotch eggs, maybe a ham. Make sure vegetarians have enough to choose from and add bowls of olives, baby tomatoes, crisps etc. This will actually not take long to make and can all be done the day before and kept cold in the fridge. Fresh fruit salad and some cream .. or bought in gateau will do for the sweet toothed!!