I'd hoped Indymedia was the last place anyone would make any concessions to the "Critical Mass is not political / political protests aren't Critical Masses" nonsense.

Purists might argue that the name 'Critical Mass' is, in this context, reserved for regular monthly rides and that such rides should not be linked to irregular protest actions. Of course you can call it what you like but standby for criticism from aforesaid purists if you cross the line.

From Wikipedia:

"However, Critical Mass participants have insisted that these events should be viewed as "celebrations" and spontaneous gatherings, and not as protests or organized demonstrations."

These protest related rides might share some similarity with critical mass but differ in major ways. They are not regular, last friday of each month - they usually have a specific destination or route as well as a 'leadership' that has planned and advertised the specific event.