Sounds like a fun weekend. If you are a good skiier and you're in the first tri, I don't see the issue. It isn't like your ute is really above your pelvis bone anyway.
I passed on skiing over Christmas. But it was terrible snow, only a couple runs were open, and I felt crummy. Not a big sacrifice. I did it more because DH is such a worrywart and I thought it was kinda cute of him.