First of all, this is all so lovely. ;w; Good job putting together all that.
Setsuna wouldn't sign up on his own will for the gift exchange, but I really want him to participate on it. Maybe someone can poke him about it and encourage him to join, because then, he would do it. :'D
If you need more volunteers to help light the tree, Setsuna can go. And the snowball fight would be cute, actually! ;; Whenever it's happening, I'm jump for that as well~