Hi, questions like that can be directed to all of us right here in the forum.
The chances of getting a meet & greet depend on how many Church Choir members request one. With these larger stadium shows, there are going to be a lot more Church Choir members and probably a smaller chance of winning a M&G in the lottery. I would still try for it though...maybe I'm a lot more of a hard-core fan than you but if there was a show close enough for me to attend, it'd be a no-brainer.
Good luck with whatever you decide to do!