 In 1868, four chief festivals in the "Church Book" were Christmas, New Year’s Day, Epiphany, and Reformation Day, with Easter and Pentecost being considered a separate category because they invariably fell on Sunday.The "Church Book" also included several minor festivals, including festivals for all the Apostles, and the Annunciation.The "Common Service Book" (1918) also expanded the calendar to help congregations determine which days took priority over others in cases of coincidence.