I think most of the Orthodox families that did participate in trick or treating, and celebrating Halloween did so because they did not recognize it as having religious origins.
But I suppose that it would be covered by Halacha, as was pointed out.
Mark
It’s also for the chilluns, and if there was ever a group “for the chilluns” the Jews, in general, are all “for the chilluns” ~ then when they grow up at 13 and become men, that’s all over and they have to worry about “the law” ~ I’d suspect that’s the theological escape hatch American Jews of all kinds use to justify allowing their kids to go on the street to accept candy from the neighbors ~ it’s NOT comparable to the Babylonian deal where they put their daughters out on the road to be de-virginized and paid a silver piece or whatever. The Babylonians wouldn’t have been wasting all those pumpkins anyway ~ it’s tough living in the desert.