The Armory Show, New York’s largest art fair, opened to the press under a menacing gray sky, with the Hudson river churning angrily alongside the two piers it requisitions for exhibition spaces. It seemed a fittingly ominous atmosphere for the city’s main festival of contemporary-art buying and champagne-soaked social climbing, whose future has recently been called into doubt. Against the British invasion, Armory is promoting its New York bona fides. Taxicab-yellow chairs are scattered throughout the piers, and at the fair’s press opening Mike Bloomberg himself praised the resilience of the city’s galleries in the wake of Hurricane Sandy, which flooded Chelsea and destroyed untold numbers of artworks. This year Armory also teamed up with the website Artsy – the years-in-the-making startup backed by Wendi Murdoch and Dasha Zhukova, among others – to let collectors preview art before the fair began.