Does Los Angeles want a big art fair?

As Frieze Los Angeles opens, we look at the LA art scene, its artist-run galleries and grassroots spaces and ask: does the city need the art-market juggernaut? We also pay tribute to the late LA-based artist John Baldessari. We look at Frieze Projects and its unique Hollywood film-set location. And we explore the latest show at the Metropolitan Museum of Art in New York, Sahel: Art and Empires on the Shores of the Sahara.