1. Statehood Day: August 15, 1959, was a historic day for Hawaii as it marked the day when the island state achieved its statehood status and became the 50th state of the United States of America.

2. Hawaiian Sovereignty Restoration Day: For many Native Hawaiians, August 15 is a day to remember their past and honor their culture. This is because the day marks the anniversary of the signing of the Kūʻē Petitions, a series of letters that protested the illegal overthrow of the Hawaiian Kingdom in 1893.

3. Obon Festival: August 15 also marks the start of the Obon Festival, a Japanese-American tradition that honors the souls of ancestors who have passed away. During the festival, participants light lanterns, perform traditional dances, and offer food and gifts to their ancestors.

4. Duke Kahanamoku Day: August 15 is also celebrated as Duke Kahanamoku Day to honor the legacy of the legendary Hawaiian surfer and Olympic gold medalist. Kahanamoku is credited with popularizing the sport of surfing and is widely regarded as one of the greatest surfers of all time.

5. Hurricane Charley: On August 15, 1958, Hurricane Charley made landfall in Hawaii, causing widespread destruction and flooding in the islands. The storm claimed the lives of four people and caused millions of dollars in damage, making it one of the most destructive hurricanes in Hawaii's history.