Widespread Panic posted this cropped version of their official Chicago poster at their instagram account (widespreadpanichq). The print, by artist Matt Leunig, looks great, includes the lakefront and iconic skyline. I'd get there early if you're interested in one of these.
Update (4/16): Here's a full version and apparently they are still available from scrapedknee.com
CLICK HERE for our Chicago visitors's guide and stay tuned to the site for continuing coverage throughout the weekend.