Late July sees the annual Shinjuku Eisa Festival. Eisa is a traditional dance originating in the Okinawan islands. The traditional costumes, dancing and drumming are quite different to what you’re likely to see in other festivals in Japan. The organizers are only expecting about 1 million people to turn up to watch! Mind you, this is Shinjuku so you probably won’t notice the difference.
The event takes place around Shinjuku Station East and West exits, and runs from 12 noon until 8pm.