1. On April 6, 1917, Hawaii's Governor Lucius Pinkham Johnson officially declared martial law throughout the islands in response to World War I. This allowed the military to have greater control over the population and important resources like food and transportation.

2. In 1943, on April 6, the United States government opened the Honouliuli Internment Camp on Oahu. This became one of the largest internment camps in Hawaii during World War II and housed thousands of Japanese Americans who were deemed "enemy aliens."

3. April 6, 1965, marked the dedication of Mauna Kea Observatories on the Big Island. These observatories are world-renowned for their incredible views of the stars and have greatly contributed to our scientific understanding of the universe.

4. On April 6, 1971, Hawaii officially became the first state in the United States to make surfing a team sport. The first official surf team was formed at the Punahou School in Honolulu.

5. In 2014, on April 6, the Hawaii National Guard held a groundbreaking ceremony for their new construction project, the Kulaniapia Training Center. This center is a state-of-the-art facility designed to aid in the training and preparation of Hawaii's National Guard soldiers and officers.