All’s fair

London will host seven international art fairs during October, including Frieze London and Frieze Masters, and there will be three more in European cities. FT Arts editor Jan Dalley, dealer and gallerist Thomas Dane, FT Collecting columnist Georgina Adam and Stephanie Dieckvoss, director of Art 13, a new event launching in March 2013, discuss the global appetite for this kind of showcase and the dangers of “fairtigue”