Go shopping one or two days before. This will give you extra time to prepare your home or backyard.
Stick with the classics. Grill hamburgers and hot dogs. It's oftentimes cheaper and easier, and in all reality, these foods are the essence of a barbecue. Also try providing a veggie option, such as grilled corn. It's simple, yet classic, and everyone is satisfied! Ask some of those coming to bring a side or a dessert and it will further simplify your party.
Setup and prepare everything beforehand, and let yourself enjoy. This way you don't have to worry about rushing around in hopes that everyone is happy. It's a summer night - it should be filled with chips, dig, and a burger, not the usual stress that may come with hosting.
Arrange for background music. Music provides a low hum that relaxes people; they don't have to worry about making conversation the entire evening. Fun music perfect for barbecuing music can include anything from Frank Sinatra and Louis Armstrong jazz to oldies by the Beatles and Creedance Clearwater Revival. Keep it low so your guests still have the chance to mingle, but if you deem it necessary, turn it up and dance.