Morgan Wallen certainly doesn't need help filling seats at his concerts, but he still called on his good buddy Peyton Manning to spread the word about his new tour ... and the Hall of Famer delivered -- rocking a fake mullet and showing off his pipes for the job!!
The country superstar announced he's going back on the road for his "One Night At A Time 2024" shows ... but instead of just posting the dates and locations on his social media, he decided to have some fun with it.