Oprah Winfrey was spotted at Bed Bath and Beyond in Framingham and at the Bristol Lounge at the Four Seasons on Thursday. . . . NECN’s Jenny Johnson was at the Institute of Contemporary Art on Thursday to dive into Boston Harbor with help from the folks with the Red Bull Cliff Diving World Series, in town this weekend. Johnson will stay dry at the 2d Annual TV Diner Summer Food Festival at Belkin Family Lookout Farm Sunday.