(CNN) Bernie Sanders and Martin O'Malley will headline an upcoming South Carolina Democratic tradition in November, according to a release from the Charleston County Democratic Party.

The fifteenth annual Blue Jamboree will take place on November 21 in North Charleston. Sanders and O'Malley have confirmed their attendance. Hillary Clinton has also been invited; event organizers and her campaign are working on the details of whether she will attend or send a surrogate.

Prominent South Carolina Democratic leaders, including Congressman Jim Clyburn and State Sen. Marlon Kimpson, will speak at the event as well.

"We are honored to have Governor O'Malley return to town. Charleston has been through a lot in the past year and Democrats are taking this primary very seriously," says Charleston Democratic Party chairman Brady Quirk-Garvan.

He expects about 750 people to attend the event.