The dreams are, in and of themselves, works of theater represented by the fears, problems, and hopes of your imagination. Theater, overall, is a dream within another dream. The plays are the staging of morals, critiques, and observations that will help you reach the desired emotional and psychological equilibrium. Since the Greek tragedies, there has always been the desire to portray intimate emotions through theater with the end of gaining wisdom, resignation before the inevitable, etc. So, dreaming that you see a play foretells a period of benefits and satisfaction in general. In the same fashion, you should try to decipher what each element of the piece means.
If you are not participating in the performance, it denotes that you are living too passively. On the contrary, if you are in the scene it signifies the desire to take the reins in your life. To do so, you should analyze and pay attention to what occurs during the play, as the plot will reveal the essence of the dream. Further, the role that you play in the piece could be very revealing.
Those wise men who have reached a high level of consciousness assure that life is like a play. You play a small and short role within the entirety of the cosmic game. When you die, you take off the costume and return to your true identity. A curious superstition says that, if you dream that your teeth fall out, you will give birth to a boy who will be very famous in the world of theater.... The Big Dictionary of Dreams
A place devoted to the presentation of created stories, a theater in a dream is a place where people gather to share a common experience. Any building in a dream is symbolic of an idea or a belief system that you have. This particular one is about themes that occur in the collective and have to do with social conformity or community agreement.
If your dream takes place in a theater, you may be exploring ways in which your community or social experience is playing out the story of your life.... Complete Dictionary of Dreams