1. King Kamehameha III declared October 31 a national holiday in 1848, known as Lā Hoʻihoʻi Ea.

2. In 1952, the first Hula Bowl was played on October 31 in Honolulu, featuring top college football players from around the country.

3. The USS Missouri, the battleship on which Japan signed its official surrender in World War II, was towed into Pearl Harbor on October 31, 1998 to become a museum ship.

4. In 2003, the Mauna Loa Observatory on the Big Island of Hawaii recorded the highest level of atmospheric carbon dioxide in 650,000 years on October 31, reaching 379 parts per million.

5. On October 31, 2019, a group of Native Hawaiian protesters blocked the entrance to the Mauna Kea access road, where construction was planned for a new telescope, leading to a months-long standoff with law enforcement and state officials.