And by no means is this meant to be judgy, but should you end up in the hospital for Christmas have you considered not telling your DS it is Christmas until you get home?
It is a bit unorthodox, but I know a mom that was going to be out of town for business for her son's third bday (completely unavoidable, she was heartbroken), they didn't tell him it was his birthday until the weekend when she was back. They partied just like it was his actual day.