Knocked Loose added STYG cuz they weren't selling enough tickets. Why else would they add STYG? What possible reason would KL have to add a drawing band if they don't need one? What drawing band would play for free?
A band on tour or about to tour can announce more tour dates. If a band is scheduled to do a Boston/NY/Philly/Balto/DC run they can announce a later Clevo/Detroit/Chicago/Milw aukee/Minny run.