I suspect, all casinos have rescinded the mask mandates, and for those who haven't, I really don't think anyone cares. They're just all going off and you barely seen anyone wear them, even on elevators. While this is purely speculative, I suspect that even if we were to have a super-duper virulent variant, I seriously doubt the hotel/casinos are ever reimposing the mandate, especially since convention money has started to refill their coffers.