On October 19 2012, Madonna was forced to cancel her Saturday October 20 MDNA concert at Dallas’ American Airlines Center due to severe laryngitis.
The press release issued by Live Nation included the following information:
Under doctor’s orders, the Material Girl has been put on “complete vocal rest” for the next 36 hours. All tickets for the October 20th show to be refunded at the point of purchase. Tickets purchased online will refunded directly. Madonna regrets any inconvenience to her fans. The second scheduled show in Dallas on Sunday, October 21st is expected to go on. There are a very limited number of seats currently available for that show.
Today In Madonna History 
The next night, Madonna lit the stage on fire and she was brilliant!
Happened to me. Was taking my mom for her first ever Madonna show that night and it got canceled. Oh well, saw her the next night. Dallas audiences suck! Most people sat through the whole thing.