“Dancing with the Stars” (9 p.m., ABC): “Dancing with the Stars” celebrates

“Dancing with the Stars” (9 p.m., ABC): “Dancing with the Stars” celebrates its 100th episode with a star-studded affair featuring appearances by many past favorites, including Apolo Anton Ohno, Mel B., Jerry Rice and Mario Lopez. But it won’t be all fun and frivolity as one more couple faces elimination.