The moment Sydney James Harcourt steps into the spotlight as Rum Tum Tugger in CATS: THE JELLICLE BALL, the temperature inside the Broadhurst Theatre rises. The audience screams and fans clack. Harcourt’s Tugger prowls the space like a rock star working an arena, not a Broadway stage. And that energy is entirely intentional. Harcourt’s take on Tugger rejects the traditionally campy, Elvis-adjacent interpretati…