CNN  —  Photographer Derek Ridgers’ introduction to the Cannes Film Festival arrived in 1984, when he was commissioned to shoot the DJ and rapper Afrika Bambaataa — in town to promote his cameo in Stan Lathan’s “Beat Street” — for the music magazine, NME. “I don’t think I’d ever really thought about Cannes, or the film festival, before I went,” Ridgers, widely celebrated for his distinctive portraits of British subcultures, told CNN via email. “Every year one sees items about it on TV, but it