Where to go to honour the dead
Events in Wales will be held at the Promenade in Colwyn Bay (7.30am-3.30pm), Swansea Beach on Oystermouth Road (11.30am-4pm), Ynyslas, Ceredigion (12.30-3.30pm) and Freshwater West in Pembrokeshire.
At each location, a large portrait of a casualty of the war, designed by artists Sand In Your Eye, will be drawn into the sand. As the tide rises, the images will be washed away while we take a moment to say a collective goodbye.
They will include a portrait of Dorothy Mary Watson from St Thomas, Swansea.
She was one of many women employed at Pembrey, where she worked alongside Mildred Owen, who lived at Bridge Street.
On July 31, 1917, Dorothy – who was just 18 – and Mildred were killed in an explosion, along with four men. The funeral in Swansea of the two female employees drew a huge crowd, with their coffins draped in Union Jacks. Fellow workers, many in uniform, acted as bearers.
An inquest was unable to identify the cause of the tragedy.