You didn't say what time the event would be, but assuming mid or late day, a large grazing bar/table would be great. Take a table and use brown paper or paper tablecloth to cover and begin filling with sorted meats, cheeses, olives, crackers, crossiants, veggies, fruit, nuts, and several spreads. Fill in any spaces with other items as needed. Guests can now come by and help themselves with whatever they like. FYI- there are several ideas on Pintrest. Good Luck.