The festival is sponsored by Japan Fisheries Agency is opened from this Friday to Sunday for promoting awareness of the bounty of the maritime produces farmed and harvested in the Tokyo Bay.
http://www.jfa.maff.go.jp/j/press/keikaku/170925.html
http://www.jfa.maff.go.jp/j/press/keikaku/attach/pdf/170925-1.pdf
