This page was last updated: February 4, 2009
In Roman Catholicism, Holy Days of Obligation are the other days in addition to Sundays that Catholics are obligated to attend Mass. Below are the Holy Days of Obligation and Liturgical celebrations for the year 2009:

Holy Days:
Sat., August 15, 2009  Solemnity of the Assumption of the Blessed Virgin Mary (abrogated because it falls on a Saturday)
Sun., November 1, 2009  Solemnity of All Saints 
Tues., December 8, 2009  Immaculate Conception of the Blessed Virgin Mary
Friday, December 25, 2009  The Nativity of the Lord (Christmas) 

Liturgical Celebrations:
February 25, 2009  Ash Wednesday
April 5, 2009  Palm Sunday
April 9, 2009 - Holy Thursday
April 10, 2009  Good Friday
April 11, 2009  Holy Saturday: **The Easter Vigil**   
April 12, 2009   Easter Sunday
April 19, 2009  Divine Mercy Sunday
May 21, 2009; transferred to Sun. May 24, 2009 The Ascension of the Lord  (Solemnity Observed)
May 31, 2009  Pentecost Sunday  (Solemnity Observed)
June 7, 2009  Trinity Sunday
Thurs. June 11, 2009; transferred to Sunday June 14, 2009)  Corpus Christi
November 22, 2009  Our Lord Jesus Christ the King (Last Sunday of the liturgical year)
November 29, 2009  First Sunday of Advent  (Beginning of new liturgical year) 
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HOLY DAYS OF OBLIGATION