Since you guys are staying west of Calgary (the only place I could think of would be Cochrane or Canmore) it may be best to meet downtown, or in Westhills. I live in the Westhills area so I can recommend some places.
I think that others live more East in Calgary so a downtown meet would make more sense...there are alot of places to hang out on steven avenue. Depending on what you guys really want, there is a wine and cheese place on steven avenue, its always booked up, I have never been but I think it would be a good time...not sure if they serve beer there as well.
They also have private rooms, I would recommend the stone cellar room, it can be setup for a more casual atmosphere ( I have been to a couple functions there before).
It would all depend on how many people are planning to attend.http://www.crmr.com/divino/private_rooms_stone.php