Actually, the two times I was there, it was really quite dull in terms of the people wandering around. The most excitement I saw was that one candidate for Prime Minister giving a van-top speech in front of Akihabara station. Oh, and a demonstration of some RC "Tokyo Drift" toy cars out on the street. No dancing in the streets, only a very few meido (some of questionable gender >__< ), and quite a few gaikokujin.