A Dinah Washington Christmas, a combination of beloved Christmas songs, a celebration of the “Queen of the Blues,” and nod to the jazz heritage of the Hill District, had its debut on Thursday in the festively decked out cabaret space at Madison Arts Center. The show on opening night was held up for a short time, in anticipation of the arrival of the playwright, Ernest McCarty. Mark Clayton Southers, Pittsburgh Playwrights Theatre Company’s founder and artistic director, learned later of the passing that night of Mr. McCarty, 84. (Condolences to the McCarty family and friends. Details to come.)