With regard to holy days the Catechism of the Catholic Church states:
"On Sundays and other holy days of obligation, the faithful are to refrain from engaging in work or activities that hinder the worship owed to God, the joy proper to the Lord's Day, the performance of the works of mercy, and the appropriate relaxation of mind and body.
Family needs or important social service can legitimately excuse from the obligation of Sunday rest.
The faithful should see to it that legitimate excuses do not lead to habits prejudicial to religion, family life, and health" - CCC 2185
Part of this commitment involves attending Mass on all Sundays and those days designated as Holy Days of Obligation in the United States. Currently those days include the following feasts:
Mary, the Mother of God - January 1st
The Epiphany of the Lord - First Sunday after January 1st
The Ascension of the Lord - Seventh Sunday of Easter
The Most Holy Body and Blood of Christ (Corpus Christi) - Second Sunday after Pentecost
Assumption of the Blessed Virgin Mary - August 15th
All Saints Day - November 1st
The Immaculate Conception of the Blessed Virgin Mary - December 8th
The Nativity of the Lord (Christmas) - December 25th
On most Holy Days which fall on a weekday, Mass at St. Peter Church is celebrated three times at 8:00 AM, 12:00 Noon and 7:00 PM.
On Christmas, Mass times are as follows:
December 24th: 5:00 PM, 7:00 PM and 12:00 Midnight
December 25th: 10:00 AM, 12:00 Noon
On Holy Days which fall on Sunday, Mass times are at the regular weekend Mass times.