Reformation Day commemorates the beginning of the Protestant Reformation. It marks the day in 1517 when Martin Luther, a German monk and theologian, is traditionally believed to have nailed his 95 Theses to the door of the Wittenberg Castle Church.

All Saints' Day is a Christian holy day dedicated to honoring all saints, both known and unknown, who have attained Heaven. It is observed by the Roman Catholic Church, Eastern Orthodox Church, Anglican Communion, and many other Protestant denominations.

All Souls' Day is dedicated to praying for the souls of the faithful departed, particularly those in Purgatory, undergoing purification before entering Heaven. It is a significant day in the Catholic Church and other Christian traditions that honor the dead.

St. Martin's Day, also known as Martinmas, is celebrated on November 11 in honor of St. Martin of Tours, a 4th-century bishop and one of Christianity's most revered saints. It is widely observed in Europe and some parts of the world with a mix of religious and cultural traditions.

Immaculate Conception Day is a major feast in the Catholic Church. It celebrates the belief that the Virgin Mary was conceived without original sin, a unique grace given by God to prepare her for her role as the Mother of Jesus Christ.

Christmas Eve is the evening or entire day preceding Christmas Day, which commemorates the birth of Jesus Christ. It is a public holiday in some countries, and it holds significant religious and cultural importance for Christians and is widely observed around the world.

Christmas Day is one of the most widely observed and culturally significant holidays around the world. It traditionally commemorates the birth of Jesus Christ, although it has also become a widely celebrated cultural holiday, often observed even by non-Christians.

Boxing Day is a holiday celebrated after Christmas Day, and it is a well-known holiday primarily celebrated in the United Kingdom and other countries that were part of the British Empire, as well as in some European nations.