Holy Days of Obligation in General
For more information: https://www.catholic.com/magazine/online-edition/what-are-the-holy-days-of-obligation
List of Holy Days of Obligation
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Mary, Mother of God: always celebrated January 1, but if this occurs on a Saturday or a Monday there is no obligation to go to Mass
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Epiphany: traditionally January 6, this holy day has been permanently translated to the first Sunday after January 1
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Ascension: this is celebrated on different days depending on which ecclesiastical province you live in; here in New York State we get to celebrate it on the traditional date, which is the Thursday of the sixth week of Easter (40 Days after Easter Sunday).
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The Body and Blood of Christ (Corpus Christi): this has been permanently translated to the second Sunday after Pentecost
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Assumption of Mary: always celebrated August 15, but if this occurs on a Saturday or a Monday there is no obligation to go to Mass
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All Saints: always celebrated November 1, but if this occurs on a Saturday or a Monday there is no obligation to go to Mass
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Immaculate Conception of Mary: always celebrated December 8
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Christmas: always celebrated December 25