Which day is celebrated on the first Sunday of May every year in various countries around the world? HomeImportant Days MCQsWhich day is celebrated on the first Sunday of May every year in various countries around the world?important days mcqsQ. Which day is celebrated on the first Sunday of May every year in various countries around the world?Coal Miners DayInternational Firefighter’s DayWorld Laughter DayWorld Homeopathy DayAnswer: World Laughter Day