Critical Mass is a monthly bicycle ride to celebrate cycling and to take back the streets. It began in San Francisco in 1992, and quickly spread to cities all over the world. Critical Mass appeared in Austin in October 1993. [more on the origin of Critical Mass]
We meet on the last Friday of every month (holiday or not, rain or shine) at 5:00pm on the UT West Mall where it meets Guadalupe (between 22nd & 23rd Streets). Participation varies a LOT. There have been as few as two riders and as many as 200. "Typical" is 50.