The Bal du Rat mort ("Ball of the Dead Rat") is an annual masquerade ball held in Ostend, Belgium in the casino. The event was first held in 1898.
In 1898, a group of members of the Cercle CÃ Âcilia from Ostend travelled to Paris. Joined by Anglo-Belgian painter James Ensor they visited Montmartre night-spots such as the Moulin Rouge and a small venue known as "Le Rat Mort". On their return to Belgium, they decided to host a ball named in its honour.
Recent Bal du Rat mort costume themes include