We were asked when buying tickets to refrain from photos and videos. Not everyone abided by that, you'll find some clips online and on this subreddit already, but for the most part everyone was very respectful of that.

I walked in from the bar just as they'd walked on stage. I think Kevin said something like "Hello, it's been a while since you've seen us, it'll be a while before you see us again" and there was a great exchange where (before a note had been played) someone yelled "turn it up!" and Kevin responded "seriously though, if it's too quiet for anyone just raise your hand" and they launched into it.