“Ancient Rhythms” at the Fringe Festival If you’re a sucker for rainbow headscarves, insistent beats, and sequins, you’ll be instantly charmed by this enthusiastic Fringe Festival contribution from D.C.’s Ancient Rhythms Dance Company. The costumes are dazzling and the performers are all great showmen, though the choreography doesn’t always take advantage of the dancers’ energy. When the narrator promises at the show’s opening to dive into “the transcendent and the mundane,” she delivers. The…