Holidays exist for a reason. They mark time, force people to slow down and think about the concepts that tie humans together.
Thats a pretty powerful thing to eliminate without replacing.
Big mistake on the part of the Org
When I was "in" I always bought my kids Halloween costumes the day after (reduced prices at least) along with tons of candy.
We always did a Turkey on T-day (because its cheap dontcha know) and I always took the kids to a lodge with snow for skiing at Xmas.
All in an attempt to give them the best of all worlds.
Now they are all "out" of the Org with me and life is so easy just letting things flow as they will.