what are catholic holy days of obligation 2018?
['January 1: The Feast of Mary, the Mother of God.', '40 days after Easter Sunday: Ascension Thursday.', 'August 15: Assumption of Mary into heaven.', "November 1: All Saints' Day.", 'December 8: The Feast of the Immaculate Conception.', 'December 25: Christmas, the Nativity of Our Lord.']