I JUST had one where I was the lead role in some random play, and it was 5 minutes to curtain and I took off this wig I was wearing and yelled at someone that I couldn't have my wig on until my makeup was done, but when I looked in the mirror it was done. Then suddenly it was 10 minutes AFTER curtain and I suddenly wasn't wearing my costume yet (oh yeah, did I mention that this whole thing was occuring on the stage?) so I ran to this costume room and started looking like crazy for a costume. It was sssoooo weird.
I've had a lot more dreams about shows, though. That's the most recent.
One of them was we were doing King and I again and I was in the audience and suddenly I go "Wow, I should go get ready" so I left my seat and went into the green to get dressed, and we were supposed to be going on stage, but they were yelling at me to get a bow in my hair (which is totally random) and I couldn't find the two girls playing my immediate sisters and it was weird.