For all those so knowledgeable: This holiday is NOT Christian in any way. that is no to say it’s not Avodah Zara because it is a Native American Avodah Zara. This holiday did not exist (and maybe still does not exist) in Europe. Proof it is not Christian. In fact, as far as i know it is only celebrated in America.
Rav Pam giving out candy is proof he had no idea this holiday had anything to do with Avodah Zara. In addition to the fact many young people don’t know that it was DANGEROUS not to back then. Yes dangerous. In Brooklyn. There could’ve have been many different kind of consequences, depending on the type of neighbors you had, or even the type of friends THEY had that specific year. Using Rav Pam as an example When he lived in not such a safe neighborhood shows that in those years it was an inyan of PIKUACH NEFESH.
Another reason I once herd from somebody who claims when he asked Rav Pam why he was doing it if the Sakana was not so bad any more, Rav Pam said, there were Jewish children in public school who are going around at least they will once taste something kosher and know that kosher food is not so bad. Also maybe they wont fear the religious people so much. (for those who remember what the attitude was toward European immigrants back then.)