Holy Days of Obligation
On December 13, 1991 the members of the National Conference of Catholic Bishops of the United States of America made the following general decree concerning holy days of obligation for Lation rite Catholics:

I
n addition to Sunday, the days to be observed as holy days of obligation in the Latin Rite dioceses of the United States of America, in conformity with canon 1246 are as follows:
January 1st

May 20th

August 15th

November 1st

December 8th

December 25th
Blessed Virgin Mary, Mother of God

Ascension of the Lord

Assumption of the Blessed Virgin Mary

All Saints

Immaculate Conception of the Blessed Virgin Mary

Nativity of the Lord (Christmas)
Whenever January 1, the solemnity of Mary, Mother of God, or August 15, the solemnity of the Assumption, or November 1, the solemnity of All Saints, falls on a Saturday or on a Monday, the precept to attend Mass is abrogated.
For information concerning Holy Days of Obligation