If there was a fair number of salt water people joining the Calgary Aquarium Society I'd probably give it a whirl.
But in my past experiences I've found that clubs and so on can be too organized.
I truley enjoy the informal meet and greet things that just happen with the salt water people that I've met here on the board. I don't think this can be duplicated in a club setting.
I hope I'm not coming across in a negative way when I say this.

(This is not my intent.)
It's just my opinion that "bigger is not always better".
When these informal reef meetings take place, they feel more like a relaxing visit with an old freind than a discussion with an agenda and recorded minutes.
I have been in the aquarium hobby for around 25 years and in reef keeping for the last 3 or 4 years.
This group of reefers where a big influence in sparking my intrest when I was planning on just getting out of it. (And the informal setting was the best part for me.)
Thanks for reading my rant.
Cheers.