Koenji Awa Odori
About 188 groups (called “ren”) and 12,000 dancers perform Awa dance to lively music and parade through the nine routes set up along the shotengai (shopping promenades), located on both north and south side of JR Koenji Station, and Konan Street of the south.
Koenji Awa Odori is the second largest of all the Awa Odori festivals held throughout Japan, following the one in Tokushima. Please see Yamato Awa Odori and Kagurazaka Awa Odori for other Awa Odori events I have attended this year.
It is also a highlight the summer of Tokyo as one of the three largest summer festivals of the area, together with Sumida River Fireworks Festival and Asakusa Samba Carnival.
First held in 1957, the festival developed into a huge event, the number of visitors has also grown significantly from few thousand into over 1.2 million.
Unfortunately, it rained during the parade, so there were a lot of umbrella which made it more difficult to watch. This picture below was taken from the JR train platform.