The Kanda festival is one of the three biggest Shinto Festivals of Tokyo. These photo’s were taking during the kids version of the festival. They carry a miniature Mikoshi (portable Shrine) around the Kanda Myojin Shrine.
The Kanda festival usually takes place around the Saturday and Sunday closest to May 15th.
For details, check the official website (in Japanese): http://www.kandamyoujin.or.jp/
The Kanda Myojin shrine is a short, 5 minute walk from Ochanomizu Station on the JR Chuo Line.