The country star opened his back-to-back run at Allegiant Stadium on May 1. Morgan Wallen performs onstage for the 16th Annual Darius and Friends St. Jude Benefit at Ryman Auditorium on June 02, 2025 in Nashville, Tennessee. Jason Kempin/Getty Images Trending on Billboard Morgan Wallen was left hanging by some of his buddies during his Still the Problem tour stop in Las Vegas. During his first of two shows at Allegiant Stadium on Friday (May 1), the country music superstar told the Sin City crowd that several celebrities flaked out on his now-traditional walkout. “Y’all got some flaky a— people in this town,” Wallen is heard saying in fan-captured footage from the show. “I had like five different people lined up to do the walkout and they all bailed on me last minute.” It was unclear at press time who Wallen had contacted for his walkout in Las Vegas. Billboard has reached out to his representatives for comment.…