ELIZABETHTON, Tenn. (WJHL) — The historic Bonnie Kate Theater in Elizabethton is bustling with excitement as it prepares for its upcoming production, a comedic adaptation of “The Princess and the Pea,” titled “Once Upon a Mattress.” On Saturday, the theater invited the public to peek behind the curtain, offering a glimpse into the meticulous preparations leading up to opening night. From costume fittings to set construction, the theater was alive with the hustle and bustle of creativity and teamwork, setting the stage for a delightful performance.