Happy to provide you with a history lesson...
Martin Luther posted the Ninety-five Theses on the door of the church at Wittenberg on October 31, 1517, because the next day, November 1, was a holy day, All Saints Day, when all the church hierarchy would be assembled.
Back then the church door was like a community bulletin board. Luther knew his written objections to Romanist sacrilege would be discussed the next day.
And so it was.
Here are Luther's Ninety-five Theses for your edification...
The eve before all All Saints Day is the Night of the Dead which turned into Halloween. Roman Catholics developed this holiday since they generally feast before they fast, i.e. Mardi Gras.
The Roman Catholics are johnny on the spot when it comes to incorporating pagan rituals/celebrations into their religion. Weird how it just seems to flow easily from one group to the next. Does anyone have any information on how many pagans rejected their former beliefs for Catholic beliefs once they joined the church? Or is it a Haiti/South American voodoo/catholic merging of convenience meant to satisfy all who enter? And no one has to reject anything, as long as Mass is performed and Eucharist is taken literally. Unity, you know...
Spare me your fractured fairy tales version of medieval history. There were nearly a dozen holy days of obligation in Germany at the time. Martin Luther chose only one of them as the occasion for a new beginning, Halloween.
Halloween was for the Celtic peoples the eve of the festival of Samhain, Lord of the dead. The Celtic year ended on the eve of Samhain. For the Pre-Christian peoples, Samhain was both the "end of summer" and a festival of the dead. It was the biggest and most significant holiday of the Celtic year. It marked the end of one year or era and the beginning of a new one and the pagan symbology was not lost on Luther.