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.

Thanksgiving Day in the Turks and Caicos Islands (TCI) is a public holiday that shares its date with the American Thanksgiving but is celebrated in a distinctly local and spiritual way, rooted in the islands' religious traditions, community values, and agricultural heritage.

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 Saints’ Day in Finland is a solemn day dedicated to honoring all saints and the memory of departed loved ones, marked by church services and the tradition of lighting candles on graves, which illuminate cemeteries across Finland during the dark autumn nights.

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.

St. Leopold’s Day in Lower Austria is both a religious feast and a regional celebration, reflecting centuries of devotion to the margrave who shaped Austria's early history. The day highlights Lower Austria’s pride in its patron saint and keeps alive traditions that date back to the Middle Ages.

Repentance and Prayer Day is a Christian observance focused on personal reflection and repentance of sins. It has its roots in Christian teachings and has been recognized historically in various countries, particularly in Germany and parts of Europe.

St. Andrew's Day honors St. Andrew, one of the twelve apostles of Jesus and the patron saint of Scotland, Greece, Russia and other countries. It is a day of religious observance and cultural celebration, especially in Scotland, where it is a national holiday.

The Day of Navarra honors both the patron saint San Francisco Javier and the regional identity of Navarra within Spain. It combines religious devotion, cultural festivities, and institutional recognition of the region’s autonomy and heritage.

St. Ambrose is the patron saint of Milan and one of the most influential figures in early Christianity. Serving as Bishop of Milan from 374 to 397 AD, he shaped the relationship between Church and State, inspired St. Augustine, and helped define Western Christian theology. His legacy endures through the Basilica di Sant'Ambrogio in Milan, a Romanesque masterpiece he founded, and the Ambrosian Rite, a unique liturgical tradition still practiced in parts of Italy today.

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.