I received a 3 night comp offer from Cosmo today. I was planning on 3 nights at Wynn and 3 at PH for my Xmas trip, but happy to swap PH for Cosmo as I enjoyed my stay there in the summer. I rang them and explained that I would need 2 rooms as my mother is coming along. She said I could have my room comped and my mother would have to pay full rate. She then said that if I booked both rooms in my name, the 2nd would be at casino rate ,but I would be responsible for all charges (which is fine). The question I have is that if I go ahead with this - would both the up front comp (which is a central marketing one) and the casino rate be guaranteed regardless of play or could they change one or both when I am there?