To begin, each person entering the stadium will be given a complementary shirt launching gun each loaded with a foam sword. When the opening ceremony begins, a crowd of actors dressed as white walkers will carry a large block of ice with a person frozen inside. This person will be a willing volunteer and totally not a troublesome councilman who tried to block the stadium's construction. The walkers will set the block of ice down in the middle of the rink and the fans in the stands will be invited to launch their swords at the walkers or the ice block. We're so confident in who they will target the actors won't even need insurance for the event. The swords will chip away at the ice and, hopefully, free the volunteer inside before they run out. If they aren't freed then, I don't know, we can have the players wield their skates and chip at the ice or something. Who cares.