Editing September 21 (section)

==Holidays and observances==
*[[Autumn equinox (Northern Hemisphere)|Autumnal equinox]] observances in the Northern Hemisphere, [[September equinox|vernal equinox]] observances in the Southern Hemisphere (see [[September 22]]):
**[[Spring Day (Argentina)]]
*Christian [[Calendar of saints|feast day]]:
**[[Ephigenia of Ethiopia]]
**[[Laurent-Joseph-Marius Imbert]] (one of the [[Korean Martyrs]])
**[[Matthew the Evangelist]] ([[Western Church]])
**[[Nativity of the Theotokos]] ([[Eastern Orthodox Church]], [[Julian calendar]])
**[[September 21 (Eastern Orthodox liturgics)]]
*[[Arbor Day (Brazil)]]
*[[Proclamation No. 1081|Commemoration of the Declaration of Martial Law]] ([[Philippines]])
*[[Customs Service Day]] ([[Poland]]) 
*[[Founder's Day (Ghana)|Founder's Day]] and [[National Volunteer Day]] ([[Ghana]])
*[[Independence Day (Armenia)|Independence Day]], celebrates the independence of [[Armenia]] from the [[Soviet Union]] in 1991.
*[[Independence Day (Belize)|Independence Day]], celebrates the independence of [[Belize]] from the United Kingdom in 1981.
*[[Independence Day (Malta)|Independence Day]], celebrates the independence of [[Malta]] from the United Kingdom in 1964.
*[[International Day of Peace]] ([[International observance|International]])<ref>{{cite web |title=International Days |url=https://www.un.org/en/sections/observances/international-days/ |website=www.un.org |access-date=2 January 2021 |language=en |date=6 January 2015}}</ref>
*[[Student's Day (Bolivia)]]
*[[Victory over the Golden Horde in the Battle of Kulikovo]] (Russia)