It's an interview...
I did a meet n' greet back in Dec. My current employee buddy told me, "Dont worry, you'll only need to answer 'Why United' and 'Tell us about Yourself.'" He was, in fact, a pants-on-fire liar. The even asked him, "Why do you want this guy to work here?"
It lasted about 40-45 minutes. Dress nice. Not a suit. While "it's not an interview," the questions sure as poop were interview questions. However, they did give excellent feedback on my answers on what would polish it up / sound better when I get the call.
About a week after the meet, my application locked, got the call a week later.
Good luck.