Some consider Yoyogi Park to be the Central Park of Tokyo. In there summer time there are free DJ concerts at night and all sorts of crazy stuff. It's a massive area and it appears that these cats are having some fun.
They are holding a night keirin race on the asphalt. Great stuff. Hey, at 2:08 a guy takes a sweet digger.
http://www.youtube.com/watch?v=FeXmlFQuCWg 