The Biennial of the Americas returned this past summer, an odd three years after its debut, and Denver Night alone was reason to welcome it back. Masterminded by the MCA's Adam Lerner and sound artist Chris Kallmyer in the spirit of blurring the edges between art and fun, the climactic gathering, which qualified as a "happening" of major dimensions, included an opera for dogs, an interactive light installation by Boulder artist Jen Lewin, Viviane Le Courtois's welcoming Human Grazing Experiment and, most notably, a fine finale to Nick Cave's stay in Denver — HEARD•DAM, which let loose an army of Cave's flowing horse Soundsuits into the park, to the delight of all. It was a world-class evening for a world-class town.