Does Boxing Day have anything to do with boxing?
Thereof, why do they call it Boxing Day?
The name is a reference to holiday gifts. A 'Christmas Box' in Britain is a name for a Christmas present. Boxing Day was traditionally a day off for servants and the day when they received a 'Christmas Box' from the master. The servants would also go home on Boxing Day to give 'Christmas Boxes' to their families.
Keeping this in view, does everyone celebrate Boxing Day?
Boxing Day takes place on December 26th and is only celebrated in a few countries; mainly ones historically connected to the UK (such as Canada, Australia, South Africa and New Zealand) and in some European countries. The 26th December is also St. Stephen's Day (or 'the feast of Stephen').
Yes, gentle readers, December 26 is Boxing Day, which for Americans is the day we recover from our eggnog and gift-exchange hangovers but for other parts of the world is a holiday in its own right.