HOLY DAYS OF OBLIGATION
Feast days to be observed by attendance at Mass and rest, as far as possible, from unnecessary servile work. The number and dates of these vary among countries. In the United States there are six holy days: Solemnity of Mary on January 1; Ascension of Our Lord, forty days after Easter; Assumption of the Blessed Virgin, August 15; All Saints' Day, November 1; Mary's Immaculate Conception, December 8; and Christmas, or the birth of Christ, December 25. On holy days the pastor of every parish is required to offer or have offered a special Mass for his parishioners.