After responding in another thread about my feelings on Critical Mass, I did a Google search and found something called "Critical Manners". It's similar to CM but it's about sharing the road rather than seizing control of it.
As a Manners' rider, you're a vehicular rider in that you obey all traffic laws. You are sharing the road and you are being nice but firm about it. It's not about wimping out to cars and it's not about breaking laws in order to say, hey, we're part of traffic too.
I think that this is more in keeping with what Canadian society is all about and it's much more inclusive. I know that I was turned off by my first and only Critical Mass and I am sure that there are other cyclists out there who would like to say that we're part of the overall road environment but in a nicer and less antagonistic manner.
It's traditionally held on the last Tuesday of each month according to Wikipedia.