As of 2015, there are numerous Holy Days of Obligation for Roman Catholics in the United States. These include the Solemnity of Mary the Mother of God, the Ascension of Our Lord, the Assumption of the Blessed Virgin Mary, All Saints Day and the Solemnity of the Immaculate Conception, as well as Christmas Day.
The Solemnity of Mary the Mother of God commemorates the unique role of the mother of Jesus in Christianity. The solemnity takes place on January 1st, one week after Christmas Day. The Ascension of Our Lord honors Jesus's ascension into heaven, taking place 40 days after Easter, itself a variable date holiday.
The Assumption of the Blessed Virgin Mary, which takes place on August 15th, is based on the Catholic belief that Mary ascended to heaven in body and soul. The Church celebrates All Saints Day on November 1st, where it honors all saints in heaven. The Catholic Church dogma teaches that the Blessed Virgin Mary was free of the concept of original sin, unlike other humans, from the very moment of her conception in the womb of her mother. Catholics celebrate this day on December 8th. The Catholic holiday of Christmas commemorates the birth of Jesus Christ.