Kip Moore is so passionate about his shows. He's been known to get mad at fans for paying more attention to their cell phones during a concert. Kip doesn't want you to miss out!
And Kip wanted. some fans who had driven 5 hours to get to one of his shows (and only got there in time for an encore) to experience some of what they had missed.
So he gave them a private show, after everybody cleared out of his concert.