New Year's Eve marks the final day of the Gregorian calendar year and is a significant occasion for many people around the world. It's a time to reflect on the past year and welcome the beginning of a new one.

The Epiphany, often referred to as the Feast of the Three Kings or Three Kings' Day, is a Christian celebration that commemorates the visit of the Magi (also known as the Wise Men or Three Kings) to the infant Jesus.

Orthodox Christmas Day is celebrated by Orthodox Christians around the world. The difference in date from the December 25 celebration of Christmas in the Western Christian tradition arises from the use of different calendars.

The Orthodox New Year is also known as the Old New Year. This tradition is observed in many Orthodox Christian countries and communities, particularly those that continue to follow the Julian calendar for religious celebrations.

Theophany, celebrated primarily in Orthodox Christianity, is a feast that commemorates the baptism of Jesus Christ in the Jordan River by John the Baptist. It emphasizes the revelation of the Holy Trinity (Father, Son, and Holy Spirit) at the baptism.

St. Cyril and St. Methodius Day is a feast day celebrated in honor of the Apostles to the Slavs, Saints Cyril and Methodius. It commemorates their missionary work, cultural contributions and role in spreading Christianity among the Slavic peoples. This day is significant in both Catholic and Orthodox traditions, as well as in many Slavic countries.