Is it wrong to say alcohol? Kidding! It's important to think of the ages of the kids attending. Adults are pretty easy to please - food and drinks. Kids are pretty to please too, if you have activities and appropriate food. When I have the whole family over no matter what we are eating for dinner I always bake up macaroni and cheese for the kids. Bring out the bucket of LEGO, colouring pages and crayons, dolls, whatever toys that promote group play. If the kids are older, set them up with a movie and fruit kabobs! Take the time to think of everyone who is coming to your party and it will be a huge success.