U should have blancebeam or a bar and tell ur friends to bring there stuff over to ur local gymnastics place
Decor:
U don't need one
Food:
Pizza, Cake, and JUNK FOOD
Music:
U should have something fun you can dance to they usally have a radio
Highlight:
U might want to try to see who can stay on the beam the longest while hoolhoping. Or u can see who can make up the best dance. I hope u have a great time!!!!!!!!!!!!