Sir Samuelsson will host Roberta Flack, the Grammy Award–winning singer of “Killing Me Softly” and “The First Time Ever I Saw Your Face,” at Ginny’s Supper Club — the roaring musical cave below Red Rooster — on Wednesday, April 11. Doors open at 6:30 p.m. and the show begins at 8:30 p.m. Tickets are priced at $20 (standing room only), $40, and $60; and can be purchased by calling 212-792-9001 or online here.