I was at this show. Like Frank said, I hope GS doesn't turn around and sue him for using his name. Frank Turner and The Sleeping Souls continue to be one of the best bands around.
Can't see the video at work, but what would he get sued for?
(Can't copyright a name, can't sue for trademark infringement unless it's used in a commercially confusing manner, defamation's a no-go without actual malice (since Simmons is a public figure) and could potentially be anti-SLAPP'ed (depending on the facts and jurisdiction); my guess is that Frank's in the clear.)