Christmas: January 1st
Solemnity of Mary, the Holy Mother of God (Holy Day of Obligation USA), Octave Day of the Nativity of the Lord
Old Calendar: Octave of the Nativity of the Lord; Circumcision of Our Lord ; Other Titles: New Year’s Day
Today the Church celebrates the Solemnity of Mary, the Holy Mother of God, our Lady's greatest title. This feast is the Octave Day of Christmas. In the modern Roman Calendar only Christmas and Easter enjoy the privilege of an octave. According to the 1962 Missal of St. John XXIII the Extraordinary Form of the Roman Rite, today is the Octave of the Nativity of the Lord, also the Circumcision of Our Lord."Mary, the all-holy ever-virgin Mother of God, is the masterwork of the mission of the Son and the Spirit in the fullness of time. For the first time in the plan of salvation and because his Spirit had prepared her, the Father found the dwelling place where his Son and his Spirit could dwell among men. In this sense the Church's Tradition has often read the most beautiful texts on wisdom in relation to Mary. Mary is acclaimed and represented in the liturgy as the "Seat of Wisdom." — Catechism of the Catholic Church 721A plenary indulgence may be gained by reciting or singing the hymn Veni Creator Spiritus on the first day of the year. This hymn is traditionally sung for beginnings of things, calling on the Holy Spirit before endeavoring something new.
Solemnity of Mary, the Holy Mother of God - Day Eight
Although New Year's Day is not celebrated by the Church, this day has been observed as a Holy Day of Obligation since early times for this feast. Each family and country has different traditional foods to eat on New Year's Day, with lentils being the main superstition: ill luck befalling those who do not eat lentils at the beginning of the year.
New Year's is a day of traditional hospitality, visiting and good cheer, mostly with a secular view, but there is no reason that this day, too, could not be sanctified in Christ.