FIND THEM -- Saturdays at 110th Street and Manhattan Avenue ; Thursdays at 175th Street ; Tuesdays and Thursdays at the downtown PATH station ; Thursdays and Fridays at Rockefeller Center ; Wednesdays , Fridays and Saturdays at Union Square ; Tuesdays at Yankee Stadium ; and Saturdays at Atlas Park and Wednesdays at Astoria , both in Queens .