The other day on an afternoon wander I had the good fortune to stumble across streamers hung through Shinjuku Chuo Park. They were hung to co-incide with a jazz festival / beer garden held through the summer. Fortunately for the jazz festival, dengue fever was found in the park after the event had finished.
Tokyo Metropolitan Govt. Building
Shinjuku Chuo Koen looking towards the Cocoon & the station