Fans shut out of Umphrey’s McGee’s intimate CBGB performance can take solace. The Chicago-sextet will perform a free show on April 21 as part of Green Apple’s EarthFair. Umphrey’s McGee is scheduled to perform a 45-minute set beginning at 1 PM on 42nd street, just outside Grand Central Station. In addition to a number of performers, EarthFair will also feature a variety of environmentally conscious vendors and other Green activities.