Well thing is that we're having our kids' birthday parties up there all that weekend. Our daughter's is next week and the boys' is right after that weekend. Since all our family is up there we usually just have the parties there and do it all in one shot. That, I think, would be Saturday. So if I can get there it'd probably be either Saturday night or Sunday morning of that weekend.
Sab, can't recommend Crystal's ski school highly enough. We had our 5 year old do both Caberfae's and Crystal's once each this year and while they were both good, she progressed faster and seemed to have more fun at Crystal. Plus they have that magic carpet which is nice for the really little kids.