http://wikitravel.org/en/Kawasaki#Do
Kawasaki's best-known event is the Kanamara Matsuri (金まら祭り), also known as
the Iron Penis Festival, held on the first Sunday in April. Penis-laden temple floats
(o-mikoshi) are paraded down the streets of Kawasaki and everybody gets sloshed.
The festival has been to some extent hijacked by foreign tourists and Tokyo's
transvestite ("new half") community, who often make up half the audience, but as
you can imagine the people running the show aren't terribly uptight and nobody
seems to mind.
