Boxing Day
I am wide open to correction here, but here goes my understanding.
Boxing Day is an ancient British tradition, the day after Christmas day.
It was a day when the servants got the day off after working on Christmas day and it was now the time for the masters to serve the servants, at which time they were all given a box of goodies, hence Boxing Day.
In England they have Boxing Day sales with some pretty good discounts, in order to reduce their inventories of stuff that didn't move prior to Christmas Day.
Sounds confusing but just trust me.
Mac