Looks like a second Chicago show on August 23rd will be added to the Summer tour.
http://www.tweetercenter.com/chicago/events.asp?eventID=54370
Jimmy Buffett & The Coral Reefer Band
August 23, 2003 – 8:00PM
On Sale either April 12th or April 14th at 10:00AM
$ 66.50 Pavilion
$ 36.50 Lawn
Parking Gates Open: Central Time
Concert Gates Open: 6:00PM Central Time