I stumbled up a cool fan site for Grace Potter and the Nocturnals (www.thisissomewhere.com).
I listened to the show mentioned in the post titled turner hall live - milwaukee, wisconsin. 3.14.08 was a special night because they debuted a new song that they had not played in concert before. They also brought up The Duo (Joe Russo and Marco Benevento) on stage for a sizzling cover of Led Zeppelin's Your Time Is Gonna Come.
Download link for that show via Archive.org.
Photo Credit: FriedFixPhoto