The culture vultures of west London have never had it so good as Art15 London, returns to Olympia’s grand exhibition halls for a third year running. It is already looking like a crowded calendar with punters spoilt for choice in terms of visual arts. There is also the inaugural Photo London and Chelsea Flower Show vying for supremacy. Read more: Photo London – A City Finally in the Frame But the opening night preview is when organisers try to woo a discerning audience of collectors and visitors. The inaugural edition of the fair, Art13 London, attracted galleries and artists from across the globe and welcomed 25,000 visitors over three days, including a host of celebrities, from fashion photographer Mario Testino to One Direction heart-throb Harry Styles. It was widely acclaimed as the most vibrant fair to debut in the capital in a decade with a varied programme for visitors and serious art connoisseurs. What started as a toe-in-the-water event now seems well-established on the crowded London arts calendar attracting celebrities, art dealers, green-horn collectors, families …