A huge carnival and ball, Bal du Rat Mort is concentrated in the casino of Ostende, Belgium, but also spread out all over the town. The carnival began at the end of the 19th century, launched by members of the Oostende Art and Philanthropic Circle (Circle Coecilia) who named the affair for a café on Montmartre (a hilly part of northern Paris, home to many artists) where they had whiled away pleasant hours. People are masked at the ball, and there’s a competition for the best costume. Discuss
Source: The Free Dictionary