La Fête du Muguet
According to French tradition, give those you love a little bouquet of Lily-of-the-Valley (Muguet), to wish them happiness and good luck in celebration of the arrival of spring.
As decreed by King Charles IX of France, who offered Lily-of-the-Valley to all the ladies of his court on May 1st, 1561, on this day anyone in France can legally sell flowers without a license to sell, as long as they are a reasonable distance away from the nearest flower shop.
La Fête du Travail
In the 19th century, demonstrating workers would wear a red triangle to symbolise 8 hours of work, 8 hours of sleep, and 8 hours of free time, later to be replaced by the Lily-of-the-valley.
May 1st officially became a public holiday after the eight-hour working day was introduced in France on April 23, 1919. Known as Labour Day in some parts of the world, it is also a day for protests, marches.