Just tell them at the box office that you have points that you want to redeem. You don't have to specify a time. Just tell them about the points when you go.
1. You can redeem your points at the box office and/or concession stand - provided that you have earned enough for a movie ticket, drink, or snack. 2. When redeeming points for tickets you do have to choose a showtime - just the same as if you were buying a ticket.
You can call and find out.
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