Last time, @u2.com hosted the pre-tour meet up at Doolin's Irish Pub on Nelson Street. The meet-up was the night BEFORE the first show, so you could still go to the meet up, and then get in the GA line early the next day, and meet even more fans from all over the world.
I'm coming from out of town, and would have no idea what the good pubs would be to do this at.
The Irish Heather is 5 minutes away from B.C. Place.
And the Boys are known to frequent whenever they're in town.