There's no scarcity of al-fresco dance in New York this summer; the latest arrival is this series of classes and performances in public spaces, organized by Gibney Dance. For the inaugural event, Gibney Dance Company's associate artistic director, Amy Miller, reprises "Still and Still Moving," her recent collaboration with the composer Peter Swendsen. She brings the work to sites in two boroughs: Foley Square in Lower Manhattan on July 10 and Pier 1 at Brooklyn Bridge Park on July 11.