Actor and Nantucket regular John Shea, of “The Good Wife” and “Gossip Girl,” emceed a benefit at the Sconset Casino on Saturday night on behalf of Lunafest, a traveling film festival. Proceeds went to the Theatre Workshop of Nantucket and the Lunafest Breast Cancer Fund. . . . Trot Nixon and Jarrod Saltalamacchia were spotted at Davio’s for dinner on Sunday.