1. Statehood Day: March 16th is celebrated as Statehood Day in Hawaii to commemorate the state becoming the 50th state in the United States in 1959.

2. The Battle of Honolulu: In 1893, the Battle of Honolulu took place on March 16th between the forces of the Kingdom of Hawaii and the United States. The battle resulted in the collapse of the Hawaiian monarchy and the annexation of Hawaii by the United States.

3. Duke Kahanamoku's Birthday: Duke Kahanamoku, a Hawaiian swimmer, surfer, and actor, was born on March 16, 1890. He is known as the "father of modern surfing" and was a five-time Olympic medalist.

4. Prince Kuhio Day: March 16th is also known as Prince Kuhio Day, which honors Prince Jonah Kūhiō Kalanianaole, a member of the Hawaiian royal family and former delegate to the U.S. Congress.

5. The Hawaiian Volcano Observatory was established: On March 16, 1912, the Hawaiian Volcano Observatory was established to study and monitor Hawaii's active volcanoes, including Kilauea and Mauna Loa. The observatory is still in operation today and provides valuable information about volcanic activity in Hawaii.