According to the 1962 Missal of St. John XXIII the Extraordinary Form of the Roman Rite, today is the feast of the apparition of St. Michael. The feast commemorates an apparition of St. Michael on the summit of Monte Gargano, in Italy on the Adriatic coast, and the dedication of the sanctuary built on the site of the apparition. It is also the feast of St. Acathius, a priest at Sebaste, Armenia, during Diocletian’s persecution.