For the pick up at the event option, the order holder will simply have to show up at the box office on site on the day of the event with the order confirmation email and a valid ID (no photocopies will be accepted).
If the order holder does not personally collect the order, the person in charge of the pickup will have to show, in addition to the confirmation email and their own ID, a written proxy signed by the order holder with a copy of their valid ID.