International Monkey Day
International Monkey Day is held on December 14. This event in the second decade of the month december is annual.
Zamenhof Day or International Esperanto Day on December 15 (International Esperanto Community);
Cat Herders Day on December 15 (This is a day for everyone who has to face the frustration of trying to manage the unmanageable);
UN Arabic Language Day on December 18 (United Nations);