Hibiya Park Marunouchi Ondo Bon-odori Dance Festival is a large Japanese folk dance festival. Dancers in Yukata (Kimono like clothes) gather around a Yagura stage and dance together.

Hibiya Park (Hibiya-koen Park) is a large garden located in Hibiya, near Imperial Palace and Ginza, becoming like an oasis in the heart of the business district. In Hibiya Park, various annual events and festivals are held throughout the year. 

Hibiya Park Marunouchi Ondo Bon-odori Dance Festival
日比谷公園丸の内音頭盆踊り大会

August 25th(Fri) -  26th(Sat) 2017
from 18:00(6:00PM) to 21:00(9:00PM)
Location: Hibiya Park, Chiyoda-ku, Tokyo

Youtube by centerctj - https://www.youtube.com/watch?v=1iklLi-ultU

Hibiya Park Info by Tokyo Metropolitan Park Association - https://www.tokyo-park.or.jp/english/park/detail_02.html

Events in Hibiya Park (Japanese web page) http://www.kanko-chiyoda.jp/tabid/1002/Default.aspx