Reformation Day offers a theological reason for its observance of Reformation Day, stating that: Alongside Reformation Day, many Protestant Churches observe All Hallow's Eve on October 31, the vigil of All Saint's Day. Reformation Day Reformation Day is a Protestant Christian religious holiday celebrated on 31 October, alongside All Hallows' Eve (Halloween) during the triduum of Allhallowtide, in remembrance of the onset of the Reformation. According to Philip Melanchthon, 31 October 1517 was the day German monk Martin Luther nailed his "Ninety-five Theses" on the door of the All Saints' Church in Wittenberg, Electorate of Saxony in the Holy Roman Empire. Historians
All Hallows-on-the-Wall subsequently fell into dereliction. Dance rebuilt the church when he was only 24 years old. He had recently returned from Italy where he had conducted detailed studies of Classical buildings. The new All Hallows took its inspiration from the Classical world and was remarkably simple in form, with no aisles; its interior consists solely of a barrel-vaulted nave with a half-dome apse at the far end, with decoration deriving from the ancient Temple of Venus and Rome in the city of Rome. Attached Ionic columns support a frieze, rather than the usual entablature. The exterior is plain and of brick,