That is really weird, I didn’t have that dream. I lived it.
Just kidding. I have had it many times. Since I moved to Philadelphia, it usually involves subbing with the Philadelphia Orchestra in some odd old building in the campus district, unknowing what will be played, and being given a square harp to play, or one with strings along the top that go sideways, and no pedals. I have also subbed with the Metropolitan Opera Orchestra at old Carnegie Hall in a bathrobe, or at Radio City Music Hall.