New York’s annual Armory Show returns this weekend in its 31st edition, with more than 230 galleries from 30 countries. Sections include “Focus,” highlighting work from the American South presented by galleries spanning Lima, Peru, to Atlanta, and the new “Function,” which explores how artists engage with design. A third section, “Platform,” features work by the famed quiltmakers of Gee’s Bend, Alabama. —Lucy Horowitz