1. The most important accessory is your smile.
2. Dance like no one is watching.
3. Be kind.
4. Be classy.
5. Don't drink or do drugs - enjoy life's natural highs.
I know that the media and popular culture have made School Formal out to be the climax of one's teenage existence, but by having such high expectations, you are setting yourself up for disappointment. Just because you have the perfect date and the perfect dress does not mean that you will have the perfect night - this is not Disney! And conversely, just because you don't have the perfect date or dress does not mean that you can't have the best night of your life (so far). It's not about your date, dress, hair, makeup or who has the best limousine. It's about celebrating your high school journey and being with the friends and peers that have shared the ride.
My advice: Relax and have fun!