Can you believe this photograph was taken in New York City? It was, and now it's time to guess which year (bonus points for guessing where in the city this party was going down).

UPDATE: The above photos (we've added a few more) were taken at the annual lawn party of the Army Relief Society (an organization that raised funds for the care of widows and orphans of officers and enlisted men of the Regular Army). These were all taken on Governors Island on May 25th, 1911.