From the US Consulate website:
Public Invited to U.S. Memorial Day Ceremony at Deadman’s Island – May 28, 2012
Historians have concluded that nearly 200 American Prisoners of the War of 1812 died while confined on Melville Island, on the Northwest Arm in Halifax, and are buried on Deadman’s Island. On Monday, May 28th from 11:00a.m. – 12:00p.m. the United States Consulate General in Halifax and U.S. Navy Exchange Officers in Halifax will honor these American servicemen in a ceremony featuring historical re-enactors, Canadian and American speakers, and a plaque unveiling by the U.S. Daughters of the War of 1812.
The ceremony will include the firing of a cannon and blank ammunition between the hours of 11:00am and 12:00 noon.