John Fogerty will not be appearing at a country music festival in Australia next month, and it sounds like even he’s not sure why. The classic rocker was scheduled to performed at Country Fest Queensland, but that plan was scrapped with an announcement sent early Tuesday morning: “Due to unforeseen circumstances,” the post begins. Fogerty is best known as the lead singer for Creedence Clearwater Revival.Morgan Evans is now the featured headliner at the festival’s website.The move comes 23 days after a post that shared enthusiasm for the 78-year-old’s appearance.Related: Your 2024 Country Music…