Eric Church has a not so secret bar backstage, and at the Denver show he had some sports celebrities shoot some whiskey with him! Peyton Manning and Michael Phelps showed up and Jack Daniels was poured while the cameras were sharing the moment with the fans on the Jumbotron before the concert.
The backstage Jack Daniels shot is a ritual before all of his shows, toasting to everybody's hard work.
Cheers!