> Like, is "Denver" really a special crowd?

As someone who frequently goes to concerts, I can absolutely testify that the audience can vary a lot between cities. You can usually tell if the band/artist is genuinly enjoying their performance or if they are doing the bare rehearsed minimum.

If you read/watch interviews with touring musicians, all have stories about how "Tokyo was crazy", "London was boring" etc – even though the set list was the exact same every evening.