A sold-out “gala presentation” of the hauntingly glorious 1947 Lerner and Lowe musical “Brigadoon” plays New York City Center through Sunday—starring a stunning cast including Kelli O'Hara, Patrick Wilson, Stephanie J. Block, Aasif Mandvi, and Robert Fairchild—and you will want to catch it (if you can) before, like the mythical town of Brigadoon, it disappears for 100 years!