Invitations: Because of the age group you can have e-mails sent out, or you can use race-theme cards. Decorations: None is necessary in your home, you may want to put up some checkered flags around, but since most   of the actual party is at a go-kart track. Activities: In this party you will want to make reservations at your local go-kart track to make sure it is only the birthday child and his or her invited friends racing. At my track I use the longest time which is 1 hour, it includes 10 minutes of qualifications and the rest is the actual race. Games: Some of the kids will probably still be in a racing mood, so you can have them play racing games on a game console. Costumes: Go-kart tracks provide protective suits, gloves, and helmets. That is pretty much the only costume. Snacks and drinks: Chips, soda, water, etc. (the usual). Cake: If you want to you can make a cake.