Prom is read as a rite of passage with high hopes and social pressure. Dream books link it to wanting to be chosen, to look right, and to mark the end of a youthful stage.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.