Watch Latin American Music Awards Bebe Neuwirth calls herself a “theater rat.” So it’s natural she’d be sitting in an old-school New York diner on Eighth Avenue, on the edge of the Broadway district, right around the corner from where she’s in rehearsals for her latest show, “Cabaret at the Kit Kat Club.” Less than two weeks from its April 21 opening, Neuwirth’s midday order is a simple one: English breakfast, hot and black. She doesn’t need the overflowing pile of creamer the waiter brings, but she’ll take that little dish for her teabag. Once that’s settled, she explains how...