This event is planned to happen on Sunday at Yoyogi Park Event Area:
But I have heard that part of Yoyogi Park is closed due to a dengue fever outbreak:
The Japan Times
Will the event be held?
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Cancellation of the event was announced on September 5.
As of September 4, the event will be held according to this document on the festival's website:
Note: Their website has invalid SSL certificate.
It says the event is held but they will have anti-mosquito coils around, and people should wear long sleeves.