Boxing Week is, at least, the six-day period that starts with Boxing Day and ends with New Year’s Eve. It may also include a few days before Christmas and/or after New Year's Day. It is not strictly a week.
Many U.S., Canadian and (increasingly) UK retailers clear their inventory in Boxing Week specials because in many cases:
Boxing Day Observed by: Commonwealth countries
Type: International, Commonwealth countries
Date: The first weekday after Christmas Day
Related to: St Stephen's Day
