Yeah, no sense calling attention to yourself.

Oh, you've never done Christmas? We kind of adopted it after Ichigo and the others talked about it (and then Urahara-san wouldn't shut up about it). It's pretty neat--you put lights on a tree and give people presents. There's some actual religious meaning to it apparently, but I don't think it's of Japanese origin. I mostly like it for the presents. And the excuse to eat lots of food.