The Feast of the Assumption celebrates Mary's Assumption into heaven. It is one of three feasts of Mary that are Holy Days of Obligation for Catholics in the United States. January 1 is the feast of Mary, the Mother of God, and December 8 is the feast of the Immaculate Conception of Mary. The assumption of the Blessed Virgin Mary into heaven has long been held as an important Catholic belief. The belief was not defined as dogma, however, until 1950 by Pope Pius XII. The dogma teaches that Mary, who was without sin, was taken, body and soul, into the glory of heaven.The Assumption is a Holy Day of Obligation! We look forward to celebrating this beautiful feast day with you.