The fourth fair Joburg Art Fair is taking place from September 23 to 25.    Artlogic director Ross Douglas says: “By moving the fair to September we hope to contribute to what is becoming an art season in the city.”    About 23 galleries will be showcasing the work by their artists; some old favourites and some newcomers on the scene.    Some of South Africa’s top wine estates and Mastrantonio Food Services have been added to enhance the standard of the show.