For, example, in my own research into the story of my local baths, I couldn’t work out why they were late opening for the 1918 – 1919 swimming season -remember, I live down under in New Zealand so the swimming season is October to March.
The answer became evident. A terrible influenza epidemic was sweeping the world after World War 1 and New Zealand, being a small country was hit particularly hard. Of course the swimming pool wasn’t open, when schools and other organisations were closed.
Knowing a bit about what was happening at the time helps the reader understand your story better. It’s worth making the effort to include the bigger picture to give a better understanding.