With the worthy mission of presenting new art from around the world together under one roof in New York, the 23rd-annual Armory Show is a massive gathering of significant modern and contemporary art on the banks of the Hudson River. More than 200 galleries will showcase established leaders and emerging voices in the visual arts, as exhibitors representing more than 30 countries lend a global perspective to this four-day art extravaganza. Tickets are available in single-day and run-of-show lengths, as well as for “happy hour” visits valid Thursday or Friday from 5 p.m. until 8 p.m., perfect for busy professionals.