International Day of Light
International Day of Light is held on May 16. Initiated by UNESCO on November 14, 2017. This event in the second decade of the month May is annual. 
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Light plays a central role in our lives. On the most fundamental level, through photosynthesis, light is at the origin of life itself. The study of light has led to promising alternative energy sources, lifesaving medical advances in diagnostics technology and treatments, light-speed internet and many other discoveries that have revolutionized society and shaped our understanding of the universe.
Similar holidays and events, festivals and interesting facts
International Conscientious Objectors Day on May 15
International Virtual Assistants Day on May 15 (the third Friday in May);
World Endangered Species Day on May 15 (This environmental date is celebrated on the third Friday of May);
Mucopolysaccharidosis Awareness Day on May 15
International Tuberous Sclerosis Awareness Day on May 15
International Day of Living Together in Peace on May 16 (adopted by the UN on December 8, 2017);
World Whisky Day on May 16 (Third Saturday of May);
World Dog Day on May 16 (started by The Vanderpump Dog Foundation in 2016. Celebrated on the third Saturday of May);
International Coeliac Day on May 16
World Nordic Walking Day on May 16 (is a day of unified commemoration of the Nordic Walking Family around the world. It is for everyone, of all ages and abilities);
European Obesity Day on May 16 (Held on the third Saturday in May);
World Heavy Metal Day on May 16
International Boys Day on May 16
Scratch Day on May 16 (date for 2022);
National Microbiologist and Clinical Chemist Day in Costa Rica on May 16
International Day Against Homophobia, Transphobia and Biphobia on May 17
World Information Society Day on May 17 (International);
World Internet Day on May 17