It's part of the convention. They pay Russ Hamilton (the location manager) to organize and guide a little tour on Thursday and Monday for about ~50 fans. Tickets are expensive, but I think they are worth it if you are interested in the behind the scenes stuff on on the show.

And yeah, I wasn't expecting to be the one of the first people to get the news! So, um, no, this doesn't happen a lot in Vancouver...it was a very uncommon day for me, I assure you. :P