Price Waterhouse Cooper has a "BC Techmap" project:
This is a big poster you can order.
Unfortunately, the preview site for it is defunct.
The map traces the linage of tech companies in BC back to the 1940's.
Here is someone's shot of the 2003 version:
If your idea of a tech scene is that there must be a mushrooming of "like Facebook, but for dogs" type startups, then indeed, no, Van is not a hotbed for that kind of thing.
I don't rule out Vancouver has companies and a tech scene, but it has potential (and has had) for more. I think of Austin, Raliegh-Durham or Berlin as examples of comparison than SF or Palo Alto.
Almost every company I've worked for in a quarter century has participated in the co-op program; we've had bright interns every year, and they all went on to work either for the same company or elsewhere.
Many people are satisfied with that, and have other hobbies outside of work other than going to meets with other programmers. Or those who have programming as a hobby would rather be actually doing that.
Also, people have significant others and families. Geek get-togethers are mostly for single people who don't have a significant other that isn't also a geek.