We were asked immediately for our Entertainment card when we went to the check-in counter at the RPR in May. It was a Wednesday morning around 8:00 a.m. when we checked in. My card was in my luggage with the bellman, and the reservation agent waited while I went and dug it out so we could present it. I would definitely be prepared to show it, or if you cannot, be prepare for them to make you pay full rate.