1. Birthday of Hawaii's Last Queen: February 21st marks the birthday of Hawaii's last reigning queen, Queen Liliuokalani, who was born in Honolulu in 1838.

2. Annexation of Hawaii: On February 21, 1893, a group of mostly American businessmen, with the support of the United States military, removed Queen Liliuokalani from power and established a provisional government. This event led to the eventual annexation of Hawaii by the United States in 1898.

3. Hawaii becomes a State: On February 21, 1959, Hawaii was officially granted statehood and became the 50th state of the United States.

4. Anti-Annexation Movement: The anti-annexation movement in Hawaii gained significant momentum on February 21, 1994, when a large rally was held in Honolulu to protest the U.S. military's use of the island of Kahoolawe for target practice.

5. Protesting Mauna Kea: On February 21, 2015, a group of protesters gathered at Mauna Kea on Hawaii's Big Island to voice their opposition to the construction of a large telescope on the sacred mountain. The protest led to the closure of the road leading to the summit and resulted in several arrests.