Lei Day in Hawaii
Lei Day in Hawaii is held on May 1. Each island in Hawaii has a special flower that represents that specific island, a holiday celebrated around the wearing and production of leis. This event in the first decade of the month May is annual. 
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As it turns out, this classic, exotic vacation spot is more than just a tropical paradise and carefree luas.
Surfing was invented in Hawaii. And there is a great deal of evidence that the modern sport of stand up paddle boarding (SUP), which is immensely popular worldwide, also originated here. Started by the beach boys at Waikiki decades ago, revived more recently by big wave surfers on Maui. By the way Maui’s Mount Haleakala is the largest dormant volcano in the world.
Hawaiians wear white pants after Labor Day. White purses. White shoes. White hats. Anything goes.
Similar holidays and events, festivals and interesting facts
Father Damien Day in Hawaii on April 15
Ka Hae Hawaiʻi Day on July 31 (Hawaii, United States);
Hawai`i Statehood Day on August 21
World Whale Day on February 15
World Marine Mammal Protection Day and World Whale Day on February 19 (is celebrated since 1986)