Holy Days of Obligation
January 1st, 2013 (Tuesday) Mary Mother of God
May 12th, 2013 (Sunday) Ascension of the Lord
August 15th, 2013 (Thursday) Assumption of the Blessed Virgin Mary
November 1st, 2013 (Friday) All Saints
December 9th, 2013 (Monday) Immaculate Conception *
December 25th, 2013 (Wednesday) Christmas
(*) The holyday obligation is suspended in the USA when the solemnity falls on a Saturday or Monday. However, this does not include the Feast of the Immaculate Conception. Because December 8th falls on a Sunday in 2013, the Feast of the Immaculate Conception will be celebrated on December 9th. However, the 9th is not a holy day of obligation.
Find additional information on the Liturgical Year
on the website of the United States Conference of Catholic Bishops.