Halloween is also for farmers the Autumn Equinox. That halfway point between autumn and winter solstice.
Halloween, All Hallows Eve, began as a time of celebration in the pre-Christian world of mostly old europe. England, Ireland, Scotland.
It was a two fold celebration Life and death. Hallows occurred at the taking in of the harvest. Collecting the crops and storing for a long winter. Celbrating the bounty of that was the tradition of Hallows eve along with recalling the dead loved one's who'd passed that same season and would not be there to enjoy the gala.
All Hallows Eve in Ireland was known as Samain, or in the old Irish also, Samhain. (pronounced "Sam-hain"
It too was a harvest celebration and a time when the dead were remembered, mourned, and yet celebrated for the life they had and that enriching, like the harvested crops, the lives of family, community.
It was not demonized until the advent of the early Christian missionairies who saw the celebration as part of the new religions Satan and practices. It was then persecuted or in some areas outlawed. This is what led to what we see today; masks. Early pre-Christian communities in order not to be persecuted for celebrating their age old tradition of All Hallows or, Samhain, would wear masks to journey to their family and or friends homes to begin the celebration and initiate the harvest. This so as not to be identified by witnesses to the authorities. Or authorities themselves.
The first "Jack-O_lantern", was a carved turnip. Then it moved to pumpkins. Hallowed out not to make eerie faces to scare little children as we do today. Rather carved out with cuts in the surface so that a candle could be set inside to serve as a lantern on the walk to the festivities.
It is not Satanic.There was not a Satan in the pre-Christian communities where Hallows celebration began.
Today's Satanists will exploit the celebration of Samhain, Hallows, or as the Church of Satan refers to it, for their own purposes. Though there are no requirements in the CoS to celebrate any holiday at all. There are dark practitioners that are Satanists. Then there are those who are actually atheists, such as Church of Satan. Identifying as Satanists because it causes believers to balk, and because those particular atheists relish carnality and satisfying the flesh because they believe this life is all there is. And thus they revel while they are able.