If you're planning a casual afternoon bash, picnic style is a great way to go. Finger sandwiches are easy to grab while on the mingle, and sides can include enticing bowls of freshly cut fruit or a colorful summer salad. You can fire up the barbecue and seduce guests with the aroma of ribs on slow and low, served with a tangy pasta salad. If a sit-down dinner is on the agenda, gazpacho is an elegant starter followed up by a light entrée of chicken or fish. Be sure to have a sweet treat on hand, no matter what time of day. A platter of freshly baked cookies is always a crowd pleaser, or a decadent chocolate mousse served in a delicate glass nicely tops off a formal affair.