If you're in Tokyo on the second Saturday of the month, then there's this 'people watching' opportunity:

http://en.wikipedia.org/wiki/Kimono_de_Ginza

Photos of past events here: http://gojyaku.hp.infoseek.co.jp/ginza-index.html

They've even published a guide on how to deal with tourists
http://www.kimono-office.com/eigo/eigo_set.html

(Next one is the 8th March. Sorry! Don't think you'll be around. Oh well, I'll still post this in case anyone else is interested)