Kicking off Wednesday in DC is the annual Smithsonian Folklife Festival. This year's edition has three major themes:
Bhutan, Land of the Thunder Dragon
http://www.folklife.si.edu/festival/2008/Bhutan/index.html
NASA: Fifty Years and Beyond
http://www.folklife.si.edu/festival/2008/NASA/index.html
Texas: A Celebration of Music, Food and Wine
http://www.folklife.si.edu/festival/2008/Texas/index.html
The Texas music will include all of the usual suspects like Asleep at the Wheel, Marcia Ball, Joe Ely, Augie Meyers, James Hand, and the Quebe Sisters, along with some lesser-known acts. List here:
http://www.folklife.si.edu/festival/2008/Texas/Music.html
And the food:
http://www.folklife.si.edu/festival/2008/Texas/Food.html