Blake Shelton will reveal details about his upcoming holiday album during a Tuesday (Aug. 7) appearance on Chelsea Lately on the E! network. He and fellow coaches Christina Aguilera, Adam Levine and Cee Lo Green have already taped segments for the new season of NBC's The Voice premiering Sept. 10. Shelton continues his tour with shows Friday (Aug. 3) at the Big Valley Jamboree in Camrose, Alberta, Canada, and Sunday at the Watershed Music Festival near George, Wash. The three-day festival in Washington begins Friday with appearances by Dwight Yoakam and Kix Brooks. Shelton's wife Miranda Lambert headlines Saturday on a bill that includes Tracy Lawrence, Sara Evans and Uncle Kracker. Shelton headlines Sunday following performances by Brantley Gilbert, Thompson Square and Thomas Rhett.