Celebrated primarily in the U.K. and other European countries, Boxing Day takes place on Dec. 26. Traditionally a day off for servants and the day when their employers would give them a “Christmas box” or monetary gift, modern Boxing Day customs include sporting events such as full programs of top-tier international football leagues, shopping, and a holiday from work. In some countries, Boxing Day is celebrated as Saint Stephen’s Day, a religious holiday honoring the first Christian martyr.