Is it possible to request and pay for an upgrade at check in for the last two days of a stay? Would this mess up things with the DDP? We check in o n8/29 for 7 nights at the CR. Currently have a garden wing std. room booked. I could not spend the $ on a MK view Tower room for all 7 nights, and it's not available all 7 nights either. I am considering splurging and trying to upgrade for the last 2 nights of our stay (rooms are available). Is it even possible?