I've never been to the Koenji Awa Odori (wrong time of the year), but fell in love with Koenji on our very first visit to Japan. Partly thanks to its Independent record stores and live houses (small concert venues), but also just its general feel.
The party returns to Koenji - The Japan Times
https://www.japantimes.co.jp/culture/2023/08/26/tokyo-festivals-koenji-awa-odori/