World Laughter Day is celebrated on the first Sunday of May each year. It was first observed in 1998 and aims to promote world peace and friendship through laughter. The day encourages people to gather in groups and share laughter, highlighting its benefits for mental and physical health. The celebration often includes laughter yoga sessions, where participants engage in laughter exercises and breathing techniques. This event is supported by various organizations, including the World Laughter Tour, which promotes laughter as a tool for healing and community building.