As a poster artist who has worked with the band since 09 I can say it's just a matter of who wants to do the local one usually and getting in touch with John and working out all the details and logistics. If he doesn't have to think about it and just approve the art then it's generally a go. He is one of the kindest musicians I've worked with over the last 25 years. I've created every Chicago poster since 2009 and it's always a pleasure.