Japan is a place where everyone is individual - but in groups. If you go to the park on a certain hour every Saturday, you'll see hundreds of boys dressed as rock and rollers, dancing to rock and roll music... very seriously.
So it's no surprise that when girls want to display groundbreaking fashions that no-one has ever seen before, they want to do it in the same place, at the same time. And that place is the Harajuku district in Tokyo.