http://catholicism.about.com/od/holydaysandholidays/a/2009_Lit_Cal.htm

January 1st - Mary Mother Of God 

January 5th-6th - Twelfth Night/Epiphany

February 24th - Shrove Tuesday/Mardis Gras

February 25th- Ash Wednesday

February 26th - Lent Begins

March 17th - Saint Patrick's Day

April 5th - Palm Sunday

April 9th - Holy Thursday

April 10th - Good Friday

April 11th - Holy Saturday

April 12th - Easter Sunday

April 19th - Divine Mercy Sunday

May 21st - Ascension Thursday
(Obligation on Sunday May 24th)

May 31st - Pentecost

June 1st - June Holiday (Lá Saoire i mí Mheitheamh)
(Ireland)

June 7th - Trinity Sunday

June 11th - Corpus Christi
(obligation Sunday, June 14th)

August 3rd - August Holiday (Lá Saoire i mí Lúnasa)
(Ireland)

August 15th - Assumption of Mary

October 31st - All Hallows Eve (Halloween)
(Ireland - Lá Saoire Oíche Shamhna)

November 1st - All Saints Day

November 22nd - Christ the King

November 26th - Thanksgiving

November 29th - Advent Begins

December 8th - Immaculate Conception

December 25th - Christmas Day (on a Friday)

December 26th - Saint Stephen's Day (Ireland)