In the U.K. and many parts of its former empire, the day after Christmas is known as “Boxing Day.” Unrelated to pugilism, the name derives from boxing up left-overs from the Christmas feast to give to the servants, sharing the largesse.
Today it is primarily a day to pursue the after-Christmas sales as retailers attempt to move their leftover holiday merchandise by cutting prices. If that is your aim, I wish you fabulous bargains.
In decades past we’ve bought the next year’s Christmas cards on this day - half price or less - as such cards are timeless. Lately, we’ve done custom cards via an Internet provider.