To see or dream that you are shutting the curtains signify secrecy and a repression of thoughts. You are concealing some personal matter or some aspect of yourself. On the other hand, to dream that you are opening the curtains indicates that you are ready to reveal something hidden about yourself.
To dream that a stage curtain is going up indicates personal development and growth. You have learned something significant about yourself. If the stage curtain is coming down, then it suggests that you need to accept some decision. You have to come to terms with the end.