To dream that you are in a movie theater represents an experience in life that is so interesting or important to you that you go out of your way to have it. A significant event or a situation that you may invest a lot of time or money in. You are making an effort to indulge yourself in something.
Situations that may encourage a dream of a movie theater may be plans to fly to another country, buying something you know is too expensive, or being very motivated to try something new. All situations where you are very focused on ensuring that something you want to experience happens at all costs.
Example: A man dreamed of being inside a movie theatre about to sit down. In waking life he had a number of plans to participate in a spiritual retreat in another country. The movie theatre reflected all his preparations to have the unusual experience at the spiritual retreat.