c. 1600, December 26
Boxing Day, also known as St Stephen's Day. or Offering Day, is celebrated on December 26th in the UK and Commonwealth nations. It originated as a day for the wealthy to give "Christmas boxes" with gifts, money, or leftovers to servants and the poor after they worked on Christmas day, as thanks for year-round service and also give a day off and for churches to distribute alms.
Now, it's a popular holiday known for huge post-Christmas sales, major sporting events (soccer, horse racing), and relaxing family time with Christmas leftovers, evolving from a charitable tradition to a mix of shopping, sports, and rest.