I have tix to the 6/29 (Sun) Black Crowes show (Sat is sold-out). I've heard conflicting reports about whether GPN will be there. The Casino is a good club venue (~2000) with great sound,  so I think it will be a good show.

I just saw GPN at the Palace Theater in Manchester, NH on Fri. It was a great concert and venue. I hope they book more rock shows there.