International Animal Rights Day
International Animal Rights Day is held on December 10. This event in the first decade of the month december is annual.
World Techno Day on December 9 (Juan Atkins was born on Dec 9, 1962, and was part of the Belleville Three, so named because of their time together in Belleville, Michigan);
Zamenhof Day or International Esperanto Day on December 15 (International Esperanto Community);
UN Arabic Language Day on December 18 (United Nations);
World Orgasm Day on December 21 (date for 2020. Celebrate the day of the winter solstice)