PROVO, Utah — The Osmond family is helping spearhead a privately funded project to build a world-class performance venue in Provo Canyon on land that has been mined for more than 100 years. The project, called the Vesper Amphitheater, was announced Tuesday. It will span roughly 100 acres and is expected to cost hundreds of millions of dollars, though organizers did not disclose an exact figure. Organizers plan to break ground in the spring of next year, with completion expected in the fall of 2028.