No.
No re-entry allowed !
There were signs when I was there saying No Re-Entry. It was just 3 weeks ago.
As long as you are in a specific area, they let you back in
Once you're out, you stay out
Once you leave no coming back
No. Once you leave you cannot get back in
There is generally a designated smoking area outside. For hockey and lacrosse games it is the doors at the top of the escalator. I imagine it is the same for concerts.
Thanks! Your answer is awaiting moderation.