Gillingham Fair fire disaster
The Gillingham Fair fire disaster (also known as the Fireman's Wedding disaster) occurred on 11 July 1929 in Gillingham, Kent, England, when a firefighting demonstration went wrong, and resulted in the deaths of 15 men and boys. == Background == Each summer in the 1920s, a fair was organized in Gillingham Park to raise funds for the local St Bartholomew's Hospital.
Source: Wikipedia — Gillingham Fair fire disaster (CC BY-SA 4.0)