There is a lot of changes to tours and shows happening right now and if you happen to have tickets to some of these shows it might be a little confusing. Live Nation stepped up and put together info for their shows on their site. It will give you info on a shows status and on refund options.
While that helps with Live Nation shows, there are still others. The best option is to start with the venue. Below is a rundown of venues near the stateline area with contact info.
Allstate Arena 847-635-6601
Rosemont Theatre 847-671-5100
House of Blues Chicago (312) 923-7060
Wrigley Field 800-THE-CUBS