Boxing Day is traditionally celebrated on 26 December, St. Stephen's Day, the day after Christmas Day. [...] --------
       Boxing Day sales are getting under way as high street* retailers open their doors to bargain-savvy shoppers.
          *High Street, or the High Street, is a metonym for the generic name (and frequently the official name) of the primary business street of towns or cities, especially in the United Kingdom. It is usually a focal point for shops and retailers in city centres, and is most often used in reference to retailing.
       Boxing Day is primarily known as a shopping holiday (a shopping spree), much as the United States treats the day after Thanksgiving. It is a time where shops have sales, often with dramatic price decreases. For many merchants, Boxing Day has become the day of the year with the greatest revenue.
-----Many retailers open very early (typically 5 am or even earlier) and offer doorbuster deals and loss leaders to draw people to their stores. It is not uncommon for long queues to form early in the morning of 26 December, hours before the opening of shops holding the big sales, especially at big-box consumer electronics retailers. Once inside, the shoppers often rush and grab, as many stores have a limited quantity of big draw or deeply discounted items ... hectic shopping experience ... customer stampedes...In recent years, retailers have expanded their deals to "Boxing Week"...
      [...] The name derives from the tradition of giving seasonal gifts, on the day after Christmas, to less wealthy people and social inferiors, which was later extended to various workpeople such as labourers and servants.
[More: http://en.wikipedia.org/wiki/Boxing_day]