Dreaming about the theatre is often associated with your social life. You might think highly of it and value that side of your time away from work and your home life. Perhaps you spend a lot of time in the theatre in your spare moments and it's something you enjoy doing.
You might have someone in your life at the moment who is acting like a 'drama queen' and you feel you are participating in their 'act' right now. It might be time to distance yourself from them or help them to be a little bit more grounded in their reactions to things.
An interruption from an audience member might be symbolic of the disruption that this person is causing in your life. They may try to drag you into their drama and you feel powerless to stop it or you believe you have reached about as much of it as you can take. You might have been considering how to tell them lately that you can no longer be part of their 'play'.
Another interpretation is that if the cast were acting out a scene that's familiar to your own situation, you are trying to make sense of it all and see it from everyone's point of view. This might help you to deal with the issue in your waking life more effectively.
One final thought is that the theatre is about you utilising all aspects of your talents and presenting these to a wider audience. If something you have done at work has been picked up by lots of people or a passion in your personal life has started to get noticed more widely, then this could be the reason you saw an avenue to express yourself in a big way in your dream.
Source: The Complete A-Z Dictionary of Dreams by Ian Wallace
tagged in Dream Interpretation