The prom is a big night you have to have the right dress, shoes, and bags and most imported is the right hair style.
When trying to decide on how to have you hair it is always good to look at what you are wearing as different hair styles can look better with different dresses.

If you’re wearing a dress that has no sleeves or a halter neck your hair can look better down there are different way you can where you’re down weather it’s all down or you can have some u for example: You code have half up half down, you code put some twisted in to one side or both side and leave back down.
A never good idea when wearing your hair down is to add so light curl or a wave

If you’re wearing a dress with sleeves or a high neck your hair can look better up as these will show of the dress you can still wear your hair down if you wish, with wearing your hair up there are lots more things you can do with it.