I had a recurring nightmare in college that I would have to go on for an actor in performance. Haven't had that one for a while, thank the lord.
Recently I've had a recurring nightmare relating to the last show I was on, which had a fairly extensive and extremely detailed/specific preset (fold the shirts exactly like this, put the blue one on top, the towel goes underneath but sticking out a little on the right side, you know the drill).
In the dream, for some reason I didn't do the preset myself, I just showed up at my call and it was already done, but it was wrong, everything was horribly wrong, and I didn't realize until the show had started. We had to stop the show in the middle of the first scene and send me onstage to fix it, which included opening up a wall to set props behind it and ruining the big act 2 reveal for the audience. Had that dream 4 times- twice during the run and twice after it closed.
Another fun one- dreamed that there was a huge snake shedding its skin in the middle of the green room, and when I told the production manager she said "Calm down, Becky! It's ok, it's not poisonous!"