What a trio. A couple days ago, Mike Campbell and Benmont Tench of Tom Petty and the Heartbreakers, Lukas Nelson and Ryan Bingham rolled through Colorado last weekend as part of the Life Is a Carnival: A Musical Celebration of Robbie Robertson tour. It’s part of an 18-show tour put on by Blackbird Presents that celebrates The Band’s 1976 Thanksgiving concert, which served as their farewell show, along with the life and legacy of Robbie Roberts. Lukas was added to the lineup a little while back to fill in for Jamey Johnson on this weekend, and per the usual, it looks like he didn’t disappoint. While obviously the focal point of the shows are on the legacy of Robbie Roberts, the guys took time out of the set last weekend to honor Phil Lesh, founder member and bassist…..