Blake Shelton played a No Rules show to wind up We Fest in Minnesota on Saturday night

“I’m getting too old for this s–t,” Shelton admitted, adding, “But because it’s my last concert of the year … No rules .Look at all these country music freaks in here,” as Shelton lovingly put it  “No rules” meant Blake could play the “long version” of his show, a two-hour set which included several older tunes like “She Wouldn’t Be Gone,” “Some Beach,” “Austin” and “Ol’ Red” among newer chart-toppers like “Sangria,” and “Drink on It.”

“I have been here before, and I don’t think I’ve seen this many people,” Shelton told the sea of fans. “Y’all are smashed in here. Somebody’s gonna end up pregnant …”

The Zac Brown Band wrapped up their three-night stint at Boston’s Fenway Park on Sunday (with an appearance by the one and only Steven Tyler, together they performed Aerosmith classics “Walk This Way” and “Sweet Emotion.”  Tyler, who is working on his own country album, admits that he is a big fan of the Zac Brown Band, citing their recent single “Homegrown” as one of his favorite country songs.

“Country’s the new rock because of people like Zac who aren’t afraid to throw in a couple of good guitar licks,”