To dream about being in a theater means that pleasure will come from impending friendships. Think about how what's onstage mirrors things in your daily living. See how the actors' roles relate to you. Maybe you're assuming a different guise.
To dream that you are laughing or clapping in a theater means that you want to have fun now, instead of concentrating on future success.
To dream about a fire in a theater indicates that you are gambling when taking on fresh endeavors.