This is on today http://cycle-space.com/?page_id=11289
"Every equinox day all over the world, between 6 and 7 pm, anyone with a bike is invited to ride it, wherever, however, they like. Our best estimate is one or two thousand participants, centred mainly in places with active promoters, will be riding with Bike Hour in mind on the next equinox, Saturday 22 September. That still makes Bike Hour the world’s largest, albeit least organised, bicycle protest."
Well, apart from POP, of course...
Still an interesting idea nonetheless