1. Hawaiian Sovereignty Day: December 12 is observed as Hawaiian Sovereignty Day, a day to recognize and honor the ongoing struggle for self-determination and the restoration of Native Hawaiian sovereignty.

2. The Overthrow of the Hawaiian Monarchy: In 1893, on December 12th, a group of American businessmen, backed by the United States military, overthrew the Hawaiian monarchy and established a provisional government. This event eventually led to the annexation of Hawaii by the United States in 1898.

3. Pearl Harbor Attack: On December 12, 1941, just five days after the surprise attack on Pearl Harbor, Governor Joseph B. Poindexter declared martial law in Hawaii, giving the military complete control over the territory.

4. Molokai Earthquake: On December 12, 1992, an earthquake with a magnitude of 6.8 struck the island of Molokai, causing extensive damage and triggering landslides. Fortunately, no one was killed in the earthquake.

5. International Human Rights Day: December 12 is also celebrated around the world as International Human Rights Day, marking the United Nations General Assembly's adoption of the Universal Declaration of Human Rights in 1948. Hawaii has a long history of activism and advocacy for human rights, particularly in regards to indigenous rights and environmental justice.