It depends on the culture of your school. In our school, prom date=bf/gf/mu.
If you have a prom date:
-expect to dance with him most of the time
-he's often with you during the night
-you're sure with your first and last dance
If you don't:
-gives more guys a chance to dance with you
-there's a small possibility that no one will dance with you on the last dance.
-bonding with friends
*Prom should be about enjoying the night; not showing off dates.
