Once a year, Canary Wharf is transformed by Dancing City. There's nothing quite like seeing aerialistes descending from the glass and steel powerhouses of corporate finance or parkour artists dashing effortlessly through the artificial garden of Cabot Square to make you look at this blue chip island quite differently. Turn up from 1pm on Sunday and be ambushed by all sorts of dance forms around Canary Wharf. See Bharata Natyam does football, a tango......