How to treat partially dislocated shoulder that I need to use?

I dislocated my shoulder today.. I guess it was partially.. It isn't a huge deal when this happens because I am double jointed it happens every once in a while. I also sublex my shoulders as a nervous habit. Anyway, I need to use my shoulder tOmorrow for a dance competition. Two medics told me to put it in a sling and ice it or 20 minutes an hour before the performance. The other one told me to just leave it.. What should ido?