I take it you are in Calgary as well? I don't know of any official M5 meets per say, although I'm sure it can be arranged if enough people are up for it. My car won't be coming out until the roads are clear from rocks though, but come summer time it's all good.
We have done a couple of meet and greets for the M5 guys in town and around (Edmnonton mostly) It's been a year or more since we have done anything. I used to belong tyo the CEAG (Calgary Exotic Auto Group) for a couple of years, and met a few local BMW guys.