Upcoming concerts by Brad Paisley and Carrie Underwood in Billings, Mont., have been canceled following a tornado that hit the local Rimrock Auto Arena on June 20. Paisley's show was scheduled for Sept. 26, followed by Underwood's on Dec. 10. Refunds will be available Thursday (July 1) when the box office reopens. Promoters are also encouraging fans to attend the artists' concerts in Bozeman, Mont., roughly 140 miles to the west. Paisley, who recently performed shows in England and Norway, is scheduled to play Bozeman on Sept. 30, while Underwood will perform there on Dec. 12.