A headliner at this weekend's Baton Rouge Blues Festival has cancelled her appearance. 

Mavis Staples' Saturday night performance at the free downtown festival has been cancelled, according to a release from organizers. Staples' cancellation comes after news of her sister, Yvonne Staples' passing. 

"Mavis Staples regrets that she has been forced to cancel her engagement at the Baton Rouge Blues Fest due to the death of her sister, Yvonne," according to a statement from Staples’ management. "Mavis loves her fans in Louisiana and is grateful to everyone who was planning to attend the event, and she sincerely apologizes for any inconvenience this unfortunate cancellation may have caused.”

"We were deeply saddened to learn of the passing of Mavis’ sister, Yvonne, and empathize wholeheartedly on her decision to be with her family at this time," the release said. "We send our condolences to Mavis and the rest of Staples family." 

Staples was going to perform at 8:15 p.m. Saturday night on the LA 1 Stage in Repentance Park. A replacement has not been announced. 

Staples' cancellation isn't the only change to the Blues Fest schedule. Additional lineup changes include the cancellation of both Bobby Powell and Hezekiah and the Houserockers "due to unforeseen circumstances," according to the release. 

DJ Swamp Boogie will replace Powell at 1:45 p.m. Sunday on the Soul of BR stage. 

Festival organizers also said in the release that the event will move forward "rain or shine." 

"We are currently working with city officials to monitor weather conditions, and will update our social media channels and website as decisions are made in regards to public safety," the release said. "Additionally, the lineup and performance times are subject to change." 

As of now, the festival will start at noon Saturday in downtown Baton Rouge. 

For more information, visit batonrougebluesfestival.org

Follow Matthew Sigur on Twitter, @MatthewSigur.