As to holiday lessons (i.e. pumpkins for Halloween, etc.) we need to keep
in mind that some students are not allowed to participate in such
lessons, even if it serves as a lesson on a related art principle.
I would feel terrible if a student had to leave the classroom for our
once a week art lesson (elem. level) when I come to their room. I have
always made it a policy to leave the holiday lessons off for this reason.