Wow, you pulled this out 3 weeks before......I kinda would have delt with it until AFTER.
Unless you can pull off your show without him.
He adds a cool sound, but we've got a set of 4 or 5 songs we'll be playing (we get 30 minutes, including set up). Out of that, there's only one that's insistent on him being there. All the others we'll be able to play without him.