Allow noncooks to participate by incorporating store-bought items into your menu. Artful arrangements of jarred sun-dried tomatoes, canned smoked mussels, stuffed grape leaves, marinated artichoke hearts and mushrooms, assorted salamis, cheeses, and roasted peppers make great, nearly instant party food. Ditto cooked shrimp, olives, breads, cakes, and cookies. Be sure to calculate the necessary amount of food correctly. How much is needed will depend on how many people you'll be feeding and the time of your party.
Luncheons require less food then evening parties.
The more items you plan, the smaller the portion sizes can be. Don't skimp on the bar. For a three hour party, expect each guest to have two to three drinks. A one-liter bottle of soda will serve three to four people. And don't forget the lemons, limes, and lots of ice.