Knee came out of place 1 day before my classical ballet award?

I don't understand the TDs other answer ears have gotten for telling you the unfortunate fact, but they are right: you must allow this sort of injury to heal. I see by your Q&A that the same thing happened to you two years ago. I suspect you didn't allow it to heal completely at that time, resulting in a weakness which cases the injury to recur. You need to see a physical therapist who understands ballet dancers to give you some exercises to strengthen your knees. If you have hyperextended knees you need a teacher who is knowledgeable in training hyperextended dancers because they have special needs that are not addressed in the average recreational school.

Talk with your teacher. Try wrapping it with an ace bandage.

Maybe water exercises in a pool.

Talk with your teacher. Try wrapping it with an ace bandage.