The Oak Ridge Boys, popular for country hits like Elvira, will replace Randy Travis at the Craven Country Jamboree.
Travis, known for songs like On the Other Hand and Forever and Ever, Amen, had been scheduled to perform at Craven Saturday afternoon, but was hospitalized with a heart condition earlier this week, has undergone surgery and is still in critical condition.
He suffered a stroke Wednesday night, and underwent surgery to relieve pressure on his brain.
Festival organizers said they were lucky to get the Oak Ridge Boys to fill in at the last minute.
The band will take the main stage at 5:30 p.m. CST on Saturday.
Performances at the four-day country music festival at Craven, northeast of Regina, begin today.
Other acts include Tim McGraw on Friday, the Dixie Chicks on Saturday and Kenny Chesney on Sunday.