NOVEMBER 27, 2011* - Start of the Advent
(On the 4th Sunday before Christmas Day or
the Sunday between November 27 and December 3)
The secular Thanksgiving holiday also coincides with the start of the four week Advent season before Christmas in the Western Christian church calendars. Advent starts on the 4th Sunday before Christmas Day on December 25; in other words, the Sunday between November 27 and December 3 inclusive.
From Wikipedia, the free encyclopedia
*Advent Sunday will be celebrated as follows:
2011 – November 27
2012 – December 2