Various Protestant churches celebrate Reformation Day on October 31st. Though it may seem like a coincidence that the day is the same as Halloween, there is actually an intimate connection between the two holidays.
Martin Luther is said to have posted his Ninety-Five Theses to the door of All Saints’ Church (also called Castle Church) on October 31, 1517. This was the eve of All Saints’ Day, or All Hallows’ Day (the origin of the name “Halloween”). It was a time when Christians were particularly focused on their dead. The unfortunate thing was that, by Luther’s time, there was tremendous confusion about just what happened to believers after death – ultimately moving Luther to address the misconceptions associated with the afterlife.