All Sundays are Solemnities and thus Holy Days of Obligation.

Solemnity of Mary, Mother of God
January 1st
(Morning Mass at 10:00 a.m. unless it falls on a Sunday)

Solemnity of the Ascension of Jesus
Moveable Feast 40 Days after Easter
Transferred from Thursday to Sunday in the Archdiocese of Washington
(Saturday Vigil Mass at 5:00 p.m.,
 Sunday Masses at 8:00 a.m., 10:00 a.m., 12:00 noon)

Solemnity of the Assumption of Mary
August 15th
(Masses at 8:30 a.m., 12:10 p.m., & 7:30 p.m. unless it falls on a Sunday)

Solemnity of All Saints
November 1st
(Masses at 8:30 a.m., 12:10 p.m., & 7:30 p.m. unless it falls on a Sunday)

Solemnity of the Immaculate Conception of Mary
December 8th
(Masses at 8:30 a.m., 12:10 p.m., & 7:30 p.m. unless it falls on a Sunday)

Solemnity of the Nativity of the Lord
 Christmas
December 25th
(Masses on Christmas Eve at
 5:00 p.m. & 7:30 p.m.
 Mass in the Night at 12:00 Midnight.
 Mass on Christmas Morning at 10:00 a.m.)

The Holy Day Obligation to attend Mass is lifted
if the Holy Day falls on a Monday or Saturday
except for Christmas & the Immaculate Conception of Mary.

New Year's Day
(Morning Mass at 10:00 a.m.)

Martin Luther King Day
(Morning Mass at 8:30 a.m.)

President's Day
(Morning Mass at 8:30 a.m.)

Easter Monday
(Morning Mass at 8:30 a.m.)

Memorial Day
(Morning Mass at 8:30 a.m.)

Juneteenth
(Morning Mass at 8:30 a.m.)

Independence Day
(Morning Mass at 8:30 a.m.)

Labor Day
(Morning Mass at 8:30 a.m.)

Columbus Day /
Indigeneous People Day
(Morning Mass at 8:30 a.m.)

Thanksgiving Day
(Morning Mass at 10:00 a.m.)

Christmas Eve & Day
(Masses on Christmas Eve at
5:00 p.m. & 7:30 p.m.
Mass in the Night at 12:00 Midnight.
Mass on Christmas Morning at 10:00 a.m.)

New Year's Eve
(Morning Mass at 8:30 a.m.)