The Grand Illumination of the National Christmas Tree takes place each year during the first week of December. As you can see here, the National Park Service is decorating the tree for the holiday season.
@nanm Nancy, yes, I took this from the Washington Monument. I hope you can go up. You can get tickets in the morning, first come first serve, or get advance tickets online.
@anazad511 Definitely plan on it. I've worked in DC for over 20 years and finally went to the top of the Washington Monument for the first time this year. This photo project was my motivation. :)