I've seen Tommy Emmanuel twice, this year and last year.
My friend saw him for the first time and walking out he said "I would do gay for Tommy", so hopefully that's enough persuasion for anyone who hasn't seen him to do so.
He is amazing, anything you can do with an acoustic - he can do it. And usually if he has a good supporting artist, the finale is awesome.
I saw him this year with Andy McKee and even got his autograph. Even though he's somewhat unknown, a guy's signature from someone who plays like him is good enough!