I asked at the bar...they took it and wrote my number down, but they certainly weren't asking for it. Not sure how you manage the check-in piece yet.
I went to the show last night but didn't use the card. It wasn't like anyone was asking for my card. And I don't know who I was supposed to give it to.
the door staph taking your ticket will have a scanner for your card. just show it to them with your ticket, and you'll be all set for your "attending a show" points.
show your card at the box office, merch, kitchen, coffee bar, and the bar when you make a purchase to get those points.