Even though admission is free to this advanced screening, you do need to reserve your seat, as seating is limited. You will need to show you ticket- either printed out or on the confirmation on your cell phone- when asked by staff at the theater.
Note: There are more tickets being given out than seating capacity. Seats are first come, first served evening of the show. Doors to screening theater open no earlier than 6:30pm for seating, although Regal Cinemas is open to the general public prior to that time.