To you Baby Boomers, I suppose it is the Vigil of the Nativity of Elvis Presley, who was born on 8 January (the same year the U.S. began providing socialized retirement income for seniors with the Social Security Act).
More importantly, I suggest, is that the 7th day of the new year is the second day within the Church's eight day celebration of our Lord's Epiphany.
Also of great interest to Christians everywhere ought to be the fact that on this day the Coptic Church, following the Coptic Calendar, celebrates the Feast of the Nativity of our Lord. Coptic Christmas is not always on 7 January. It shifts slightly over time. However, for the next several decades it will be on this day. Happy and blessed Christmas, then, to our Coptic brethren.