Question: Where did the holiday that falls on the day of the 2013 Sydney to Hobart Yacht Race originate?

Context paragraphs:
2013 Sydney to Hobart Yacht Race: The 2013 Sydney to Hobart Yacht Race, sponsored by Rolex, is the 69th annual running of the "blue water classic" Sydney to Hobart Yacht Race.  As in past editions of the race, it is hosted by the Cruising Yacht Club of Australia based in Sydney, New South Wales.  As with previous Sydney to Hobart Yacht Races, the 2013 edition began on Sydney Harbour, at 1pm on Boxing Day (26 December 2013), before heading south for 630 nautical miles (1,170 km) through the Tasman Sea, past Bass Strait, into Storm Bay and up the River Derwent, to cross the finish line in Hobart, Tasmania.

1999 Sydney to Hobart Yacht Race: The 1999 Sydney to Hobart Yacht Race, sponsored by Telstra, was the 55th annual running of the "blue water classic" Sydney to Hobart Yacht Race.  As in past editions of the race, it was hosted by the Cruising Yacht Club of Australia based in Sydney, New South Wales.  As with previous Sydney to Hobart Yacht Races, the 1999 edition began on Sydney Harbour, at noon on Boxing Day (26 December 1999), before heading south for 630 nautical miles (1,170 km) through the Tasman Sea, past Bass Strait, into Storm Bay and up the River Derwent, to cross the finish line in Hobart, Tasmania.

2003 Sydney to Hobart Yacht Race: The 2003 Sydney to Hobart Yacht Race, sponsored by Rolex, was the 59th annual running of the "blue water classic" Sydney to Hobart Yacht Race.  As in past editions of the race, it was hosted by the Cruising Yacht Club of Australia based in Sydney, New South Wales.  As with previous Sydney to Hobart Yacht Races, the 2003 edition began on Sydney Harbour, at Noon on Boxing Day (26 December 2003), before heading south for 630 nautical miles (1,170 km) through the Tasman Sea, past Bass Strait, into Storm Bay and up the River Derwent, to cross the finish line in Hobart, Tasmania.

2004 Sydney to Hobart Yacht Race: The 2004 Sydney to Hobart Yacht Race, sponsored by Rolex, was the 60th annual running of the "blue water classic" Sydney to Hobart Yacht Race.  As in past editions of the race, it was hosted by the Cruising Yacht Club of Australia based in Sydney, New South Wales.  As with previous Sydney to Hobart Yacht Races, the 2004 edition began on Sydney Harbour, at Noon on Boxing Day (26 December 2004), before heading south for 630 nautical miles (1,170 km) through the Tasman Sea, past Bass Strait, into Storm Bay and up the River Derwent, to cross the finish line in Hobart, Tasmania.

2001 Sydney to Hobart Yacht Race: The 2001 Sydney to Hobart Yacht Race, was the 57th annual running of the "blue water classic" Sydney to Hobart Yacht Race.  As in past editions of the race, it was hosted by the Cruising Yacht Club of Australia based in Sydney, New South Wales.  As with previous Sydney to Hobart Yacht Races, the 2001 edition began on Sydney Harbour, at noon on Boxing Day (26 December 2001), before heading south for 630 nautical miles (1,170 km) through the Tasman Sea, past Bass Strait, into Storm Bay and up the River Derwent, to cross the finish line in Hobart, Tasmania.

Boxing Day: Boxing Day is a holiday celebrated the day after Christmas Day.  It originated in the United Kingdom, and is celebrated in a number of countries that previously formed part of the British Empire.  Boxing Day is on 26 December, although the attached bank holiday or public holiday may take place either on that day or two days later.

2012 Sydney to Hobart Yacht Race: The 2012 Sydney to Hobart Yacht Race, sponsored by Rolex, was the 68th annual running of the "blue water classic" Sydney to Hobart Yacht Race.  As in past editions of the race, it was hosted by the Cruising Yacht Club of Australia based in Sydney, New South Wales.  As with previous Sydney to Hobart Yacht Races, the 2012 edition began on Sydney Harbour, at 1pm on Boxing Day (26 December 2012), before heading south for 630 nautical miles (1,170 km) through the Tasman Sea, past Bass Strait, into Storm Bay and up the River Derwent, to cross the finish line in Hobart, Tasmania.

2011 Sydney to Hobart Yacht Race: The 2011 Sydney to Hobart Yacht Race, sponsored by Rolex, was the 67th annual running of the "blue water classic" Sydney to Hobart Yacht Race.  As in past editions of the race, it was hosted by the Cruising Yacht Club of Australia based in Sydney, New South Wales.  As with previous Sydney to Hobart Yacht Races, the 2011 edition began on Sydney Harbour, at 1pm on Boxing Day (26 December 2011), before heading south for 630 nautical miles (1,170 km) through the Tasman Sea, past Bass Strait, into Storm Bay and up the River Derwent, to cross the finish line in Hobart, Tasmania.

2002 Sydney to Hobart Yacht Race: The 2002 Sydney to Hobart Yacht Race, sponsored by Rolex, was the 58th annual running of the "blue water classic" Sydney to Hobart Yacht Race.  As in past editions of the race, it was hosted by the Cruising Yacht Club of Australia based in Sydney, New South Wales.  As with previous Sydney to Hobart Yacht Races, the 2002 edition began on Sydney Harbour, at noon on Boxing Day (26 December 2002), before heading south for 630 nautical miles (1,170 km) through the Tasman Sea, past Bass Strait, into Storm Bay and up the River Derwent, to cross the finish line in Hobart, Tasmania.

2000 Sydney to Hobart Yacht Race: The 2000 Sydney to Hobart Yacht Race, sponsored by Telstra, was the 56th annual running of the "blue water classic" Sydney to Hobart Yacht Race.  As in past editions of the race, it was hosted by the Cruising Yacht Club of Australia based in Sydney, New South Wales.  As with previous Sydney to Hobart Yacht Races, the 2000 edition began on Sydney Harbour, at noon on Boxing Day (26 December 2000), before heading south for 630 nautical miles (1,170 km) through the Tasman Sea, past Bass Strait, into Storm Bay and up the River Derwent, to cross the finish line in Hobart, Tasmania.

Supporting paragraphs: 2013 Sydney to Hobart Yacht Race Boxing Day
Answer: United Kingdom