Cześć Adam,
Welcome to the forums and thanks for reaching out.
What might help you in this case is Events Calendar Pro. The Pro extension of our plugin supports the creation of recurring events, so basically you can set up one movie event with different recurrence rules. The rules can be customized in detail, basically any way you want: daily, weekly, monthly, custom days of the week, custom dates and so on. Check the screenshot of some of the settings.

Though I’m afraid all instances of a recurring event will show up on your calendar. In my thinking, if you have a movie on September 10-11-12, as a customer I would like to see it in the calendar on all dates.
Please let me know if this helps. Also, if you give me a more detailed explanation of what your desired outcome is I can try to help you further.
Cheers,
Andras