Its a parade. It makes 2 or 3 stops along a route in DCA. When it stops they play loud music and dance. There are a lot of pixar characters as well as dancers. They get children out of the crowd to dance with them. At the end they shoot out small nerf balls for the kids. It is running at 5:15, and DCA closes at 6 on weekdays. That is why people are talking about leaving after it is over.