This festival is one of the traditional Matsuri held at Tokyo. Fukagawa Jinmeigu Shrine is the center of the festival and all towns around the shrine will carried their own Mikoshi until Sunset. Some of the Mikoshi including huge Shrine Mikoshi survived through the confusion of WWII and Kanto Earthquake. "Wasshoi" is the traditional call out for the Matsuri, and people are throwing at water to the Mikoshi carriers. Matsuri of Tokyo had began at the beginning of Edo Period to make a strong relationship and friendship at Edo towns because, at this time, many people moved in Edo. So, there were many strangers overflowed in Edo. Matsuri had started to connects those strangers tight in relationship. Today, you can still see how it's important for all people in Fukagawa towns.
The real tradition is still carried by real Edo people in this Matsuri.