As the caption accompanying this image from September 4, 1904 indicatres, this image shows Katherine Mackay leaving the front door of the Mackay Mansion to arrange for the fair she staged there for the benefit of the Nassau Hospital.
The caption accompanying this image reads as follows:
September 4, 1904: Katherine Mackay leaving Harbor Hill to arrange for the fair she staged there, for the benefit of the Nassau Hospital.
See Harbor Hill, Clarence Hungerford Mackay's Mansion.