Okay. The Lighting of the National Christmas Tree. Blah. I went five years ago and nearly froze to death. They took my Clementine oranges because they could be used as weapons. I was cold and fruitless. If you still want to go, line up on Saturday at 8am at the Ellipse Visitor Center (clarification- it is the South West corner of 15th & E in case it wasn't clear...15th & E NW). Four tickets per person. I will go if you get me a ticket but I will not line up.
Technically speaking, you'll want to be there earlier than 8am. People CAMP to get these tickets.