"Victoria Day...also being considered an informal mark of the beginning of the summer season.
"Victoria Day is a federal holiday, and as such, has always been officially recognized for Quebec. However, Quebecers were not implied in its celebration: this day was unofficially known as Fête de Dollard ever since the quiet revolution in Quebec. In 2003, the government of Quebec passed a mandate for the creation of National Patriots' Day, which was officially recognized on the federal level and made to coincide with Victoria Day."
"...The holiday is colloquially known as May Two-Four in most parts of Canada;[11][12] a double entendre that refers both to the date on which the holiday usually falls (24 May) and the Canadian slang for a case of 24 beers (a "two-four"), a drink popular during the long weekend."
http://en.wikipedia.org/wiki/Victoria_Day