Airports, like software, need to be tested before they're released -- or I guess for an airport, you'd say opened. That's why the Greater Toronto Airports Authority, which operates Toronto Pearson International Airport (YYZ), is asking for volunteers to come to the airport on the morning of Oct 28th and wander around like they were trying to catch a flight, or arrive from a flight, or whatever. Can you read that sign as you head down the elevator? Is it obvious that you are not at ground level and need to find an elevator to get to ground level? Is this hallway really wide enough when two planes arrive at once and 400 people are walking through it? It's not like there wasn't any thought put into that sort of thing in advance, but before you open the doors, testing is a really good idea.
If you live in the Greater Toronto Area and want to tell your grandchildren you once beta tested an airport (perhaps the fact that you parked and ate at an airport for free will excite them more) then head on over to http://www.gtaa.com/airportvolunteer/ and sign up. Apparently there's some sort of souvenir in it for you, and you'll get to see the new parts of the terminal months before they open. Go for it!