_The Evening Post_, 15 September 1924:
NELSON COLLEGE WAR MEMORIAL
The attention of the Old Boys of #Nelson College is directed to an advertisement in another column in connection with the opening of the #Scriptorium, which has been erected by the Old Boys’ Association as a memorial to the old boys of the college who fell in the late war. His Excellency the Governor-General will perform the opening ceremony and unveil the memorial tablet. The principal of the college desires to know as soon as possible the number of old boys likely to be attending the ceremony, and those intending to be present are requested to notify the honorary secretary of the Wellington branch of the Old Boys’ Association on or before Friday next.
https://paperspast.natlib.govt.nz/newspapers/EP19240915.2.116
Many New Zealand soldiers fell during the Battle of Flers–Courcelette that began on 15 September 1916. There are several “In Memoriam” messages this day https://paperspast.natlib.govt.nz/newspapers/EP19240915.2.2.1
See also Te Ara Encyclopedia https://teara.govt.nz/en/first-world-war/page-5#:~:text=suffered%2060%2C000%20casualties.-,Longueval,-The%20New%20Zealandand Wikipedia https://en.wikipedia.org/wiki/Battle_of_the_Somme#Battle_of_Flers%E2%80%93Courcelette,_15%E2%80%9322_September