Neil Patrick Harris Hosting 2012 National Christmas Tree Lighting Ceremony I thought I had completely missed this event. Something enjoyable from DC---a rare treasure. The WH is decorated for Christmas--lots of trees, I assume. The theme is 'Joy to All'. The national tree will be located on the Ellipse in DC. ??The Mall--somewhere around there?? Tune in. Jason Mraz and others will perform. Neil Patrick Harris will host.