#church_calendar__ecclesiastical_calendar  a calendar of the Christian year indicating the dates of fasts and festivals
  supertype:  Gregorian_calendar__New_Style  the solar calendar now in general use, introduced by Pope Gregory XIII in 1582 AD to correct an error in the Julian calendar by suppressing 10 days, making Oct 5 be called Oct 15, and providing that only centenary years divisible by 400 should be leap years; it was adopted by Great Britain and the American colonies in 1752
  part:  Holy_Week__Passion_Week  the week before Easter
  part:  Advent  the season including the four Sundays preceding Christmas
     part:  Advent_Sunday  the first of four Sundays of Advent
  part:  Shrovetide  immediately preceding Lent
     part:  Mardi_Gras__Shrove_Tuesday__pancake_day  the last day before Lent
  part:  Lent__Lententide  a period of 40 weekdays from Ash Wednesday to Holy Saturday
     part:  Good_Friday  Friday before Easter
     part:  Ash_Wednesday  the 7th Wednesday before Easter; the first day of Lent; the day following Mardi Gras (`fat Tuesday'); a day of fasting and repentance
  part:  Whitsun__Whitsuntide__Whitweek  Christian holiday; the week beginning on Whitsunday (especially the first 3 days)
     part:  Pentecost__Whitsunday  seventh Sunday after Easter; commemorates the descent of the Holy Spirit on the apostles; a quarter day in Scotland
     part:  Whitmonday__Whitsun_Monday  the day after Whitsunday; a legal holiday in England and Wales and Ireland
     part:  Whit-Tuesday__Whitsun_Tuesday  the day after Whitmonday

No statement uses or specializes church_calendar; click here to add one.