The National Christmas Tree is illuminated during the lighting ceremony on the Ellipse in Washington D.C., Dec. 1, 2011. The White House is visible in the background. (Official White House Photo by Lawrence Jackson) Though it's still October, preparations are already underway in the nation's capital for the holidays. On December 6, for the 90th time, we'll celebrate the lighting of the National Christmas Tree, and if you'd like to attend, the lottery for tickets starts today. To sign up for your chance, visit Recreation.gov and follow the instructions. Even if you can't be in Washington, DC, you'll still be able to watch the festivities, live online on December 6 at http://www.thenationaltree.org/ . For more information about the White House and the holidays, keep visiting WhiteHouse.gov .