Sun Screen Day or Sunscreen Protection Day
Sun Screen Day or Sunscreen Protection Day is held on May 27. This event in the third decade of the month May is annual. 
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Sunscreen and sunblock are not the same thing, although many people use the words without thinking about the definition. They are actually two entirely different forms of sun protection.
Sunscreen: Sunscreen is the more commonly used type of sun protection. It filters or screens the sun's ultraviolet (UV) rays. It keeps most rays out but lets some in. It may also be called a chemical sunscreen.
Sunblock: Sunblock reflects the sun's rays away from the skin. It blocks the rays from penetrating the skin. It may be called a physical sunscreen.
Similar holidays and events, festivals and interesting facts
World Lindy Hop Day on May 26
Cellophane Tape Day on May 27 (Cellophane tape was invented in the 1930’s with the purpose of putting a seal on an amazing new substance called, you guessed it, cellophane);
Hoarding Day on May 27
Dragon Quest Day on May 27
Learn About Composting Day on May 29
Put A Pillow On Your Fridge Day on May 29
Kimono Day in Japan on May 29 (Gofuku No Hi)