No! Get a new dress for the new occasion
exchange your junior dress
If your dress is still fits you can do it a few small decorations then it looks different and beautiful too
Don't recommend wearing the same dress. Borrow a girls dress or go to a cheap dress shop. I went to Neumann Marcus outlet and got a dress for 100, while an identical dress at another store was 550
Maybe you could swap yours with a friend....
You should exchange your junior dress for another girl's dress , maybe a girl from other school. That way both of you get a new dress pretty much