>> A singer-songwriter showcase featuring Martin Royle of Washington Social Club, Mick Coogan of The Dance Party and Stephen Kilroy of Middle Distance Runner is being billed by MDR as “Steve, Martin tonight at the Black Cat!” Which is technically true, though we’re guessing the show will be a little more earnest guitar playing and a little less Wild and Crazy Guy. Black Cat’s back stage. $8, 9 p.m. >> Redskins CB Carlos Rogers…