If you dream of being in a movie theatre, it can mean that you are trying to disconnect yourself from the negative things that are happening in your waking life.
If your waking issues are on a movie screen this is a means of escapism or distancing yourself from the reality of them. It could be that your subconscious is trying to protect you from having to experience something or meet someone who could be a bad influence on you.
Another interpretation is the coming together of people, a crowd or an accumulation of people. Perhaps you feel the need to get all your nearest and dearest together if you've not seen them in a while or maybe you are planning an event that involves a lot of people you know and love.
On the flipside, maybe you fear this happening- perhaps you are uncomfortable at the thought of your family and friends being under one roof if there has been some discontent between a few of them lately.
It’s not customary to talk in the cinema, so if you were with your partner, it could be a sign that you lack communication in your relationship. Perhaps you need to place greater focus on this and do things that bring you closer together not put you in situations where it's not acceptable or possible to talk to one another.
Maybe you need to treat yourself a little better- perhaps you prefer to imagine yourself as someone else, something more than you are rather than embracing your own worth. It might be time to give yourself a break and focus on the things you are rather than what you're not because your personality, the way you see the world and your appearance are the things that make you unique.