What are the holy days of obligation?
The holy days of obligation in the Catholic Church are mentioned in the Catechism in the section on the Precepts of the Vhurch (paragraphs 2042,43), and are listed in paragraph 2177. The are: “the Nativity of our Lord Jesus Christ [December 25th], the Epiphany [January 6th], the Ascension of Christ [40 days after Easter], the feast of the Body and Blood of Christ [60 days after Easter], the feast of Mary the Mother of God [January 1st], her Immaculate Conception [December 8th], her Assumption [August 15th], the feast of Saint Joseph [March 19th], the feast of the Apostles Saints Peter and Paul [June 29th], and the feast of All Saints [November 1st]. The conference of bishops has the authority to suppress a holy day of obligation, or to transfer its observance to the nearest Sunday, with the approval of the Vatican. In Canada, the Epiphany, the Ascension, and the feast of the Body and Blood of Christ are transferred to the following Sunday. Of the remaining days listed in the Catechism,