All Holy Days of Obligation in the United States are denoted in black bold font, below.

Advent:

 

Christmastide:

 

The Time After the Epiphany:

 

Septuagesima:

 

Lent:

 

Passiontide:

Note on the Revised Ordo of Holy Week, promulgated Nov 1955.

 

Easter:

 

The Time After Pentecost:

   The Ember Days in September are celebrated during the week following the calendar week in which September 14 falls. They are found after the 17th Sunday after Pentecost in the Missale Romanum.