490 years ago today, Martin Luther posted his Ninety-Five Theses on the Power of Indulgences on the public bulletin board in Wittenberg, Germany (another function of the Castle Church's front door).
Celebrate by dressing up and re-enacting one of the turning points that led to the Restoration. Or if you already have a costume picked out, pause a moment to sing "A Mighty Fortress is our God" in the midst of your tricks & treats today.