The Critical Mass Rides is a worldwide Critical Mass that will take place in a lot of locations on the same day: September 8. here you have the call  (in Spanish). Basically, it works similarly as the Critical Mass, but different groups are preparing special events to make it impressive and funny with aims such as human health, environment, streets for people, etc. The Critical Mass Rides link indicates concepts and tips to make it successful, though you can follow them or not. Moreover, it encourages bikers in places where there is not Critical Mass to join the cause and spread the word. In fact, this event could be the seed of the Critical Mass where it does not exist today thanks to the global impulse.