Holy Days of Obligation are specific days in the Catholic Church’s liturgical calendar when the faithful are required to attend Mass and participate in the celebration of the Eucharist. These days hold particular religious significance and commemorate essential events and mysteries in the life of Jesus Christ, Mary, and the Saints.

The exact list of Holy Days of Obligation may vary from one country to another, so it is advisable to consult with the local diocese or parish to confirm the specific days observed in a particular region. However, there are common Holy Days of Obligation in many Catholic traditions:

• Solemnity of Mary, Mother of God (January 1): This Holy Day of Obligation commemorates the role of Mary as the Mother of Jesus Christ.
• Ascension of Jesus (40 days after Easter, celebrated on the 6th Sunday of Easter in some regions): This day marks Jesus’ ascension into heaven after His resurrection.
• Assumption of Mary (August 15): This Holy Day celebrates the belief that Mary was assumed, body and soul, into heaven at the end of her earthly life.
• All Saints’ Day (November 1): This day honors all the saints, known and unknown, who have attained heaven.
• Immaculate Conception (December 8): This Holy Day celebrates the belief that Mary was conceived without original sin.
• Christmas (December 25): The most widely celebrated Holy Day, Christmas commemorates the birth of Jesus Christ.

Some countries or regions may have additional Holy Days of Obligation, and some may have variations in the observance of the above-listed days. In some cases, the obligation to attend Mass on certain Holy Days of Obligation may be transferred to the nearest Sunday, making it more convenient for the faithful to fulfill their obligation.

It’s important to note that while attendance at Mass is obligatory on these specific days, the Catholic Church encourages regular attendance at Mass on all Sundays and Holy Days, emphasizing their spiritual importance in the life of a Catholic.