This festival is touted as one of the “three strangest festivals in Kanto”. Given that the competition includes a festival parading giant phalli and another in which participants have faces painted on their bellies, that’s really saying something.
The festival takes place mainly in and around the Okunitama Shrine over a period of 6 days. The first day involves a trip to Shinagawa to collect seawater. The main days for activities appears to be on the middle Thursday and Friday.