I do agree that EXCESSIVE tuning is wrong. IF the classical group that Leeneia saw did that before EVERY piece, then I would demand my money back.

I saw a group - an old-timey string band, that was highly recommended. I was hoping to book them for the Hurdy Gurdy Folk Music Club, but when I saw them it was awful. They would spend up to five minutes tuning between every song or tune - trying to get in sync with each other and occasionally arugeing about who was in tune. I could tell the audience was restless and not happy. It is one thing to be an amateur and play for fun, but when you expect people to pay to watch you perform I would hope that tuning would not be such an ordeal.   

Again, based on what I read from Leeneia's original note, I think the classical group was well within acceptable behavior and it would not be an issue.