The museum will remain open until 6.30pm ahead of a service and beacon lighting at the War Memorial in St Peters Street.
There will be a chance to visit the two First World War displays in the museum and also to watch a screening of the film A County at War in the The John Apthorp Learning Studio at 4.30pm.
Tickets are free but to guarantee your place, reserve yours in advance.
The running time is 50 minutes.
A County at War
Made from photographs supplied by local museums and the public, this film highlights the unsung heroes of the Home Front.
Offering a fresh and surprisingly local view of the First World War, A County at War, Life on the Home Front in Hertfordshire is interlaced with original recordings and songs of the period and makes compulsive viewing.
It is often haunting, ultimately uplifting and forever Hertfordshire.
Running time: c. 50 minutes.
As part of the St Albans Remembers season.