“Why come to Vail,” Damian Woetzel once asked, “and dance at 8,000 feet?” Because the Vail Dance Festival, which Woetzel directs, annually offers choreography, dance, and collaboration that’s as heady and fresh as the surrounding Rocky Mountains. This season features a world premiere by Alonzo King, a new production of The Little Prince from BalletX, the Martha Graham Dance Company, and much more. —L.J.