Anyone down for a mini road trip? Blake Shelton's Twitter just gave a lot of us the perfect excuse to call into work on Thursday 09/20/18. Blake Shelton will be playing a pop-up show at Billy Bob's Texas in Ft. Worth. The best part about the concert? The best part about the concert? It's FREE! However the show will be a first come, first serve basis to the first 5,000 fans. All fans must be 21 and up. The show starts at 8:30 p.m. Thursday night, but the line-up for wristbands to the show will kick off at 10 a.m. Thursday, according to Billy Bob's Texas.