Seen on Facebook last week: http://www.facebook.com/event.php?eid=233720509994966
Victoria Centre Clock Tower - Friday, July 29 · 5:30pm - 8:30pm
Also Veggies: http://www.veggies.org.uk/event.php?ref=213
Critical Mass is a monthly bicycle ride to celebrate cycling and to assert cyclists' right to the road. The idea started in San Francisco in September 1992 and quickly spread to cities all over the world. It is typically held on the last Friday of every month in over 300 cities
The purpose of Critical Mass is not usually formalized beyond the action of meeting at a set location and time and traveling as a group through city or town streets on bikes.
from: http://en.wikipedia.org/wiki/Critical_Mass
See also: http://critical-mass.info/origin.html
