Editing September (section)

=== Movable Gregorian ===
[[File:2008-05-04 at 18-26-44-Forgetmenot-Flower.jpg|thumb|right|[[Forget-me-not]], September birth flower]]
* [[Engineer's Day|Engineering Day (Egypt)]]
* [[White Balloon Day]]
* [[Day of the Programmer]]
* [[Te Wiki o te Reo Māori]] (Māori Language Week) ([[New Zealand]])<ref>{{Cite web |url=https://www.tewikiotereomaori.co.nz/ |title=Home » te Wiki o te Reo Māori |access-date=2020-02-05 |archive-date=2020-02-06 |archive-url=https://web.archive.org/web/20200206075938/https://www.tewikiotereomaori.co.nz/ |url-status=dead }}</ref>
* See also [[Movable Western Christian observances]]
* See also [[Movable Eastern Christian observances]]

==== First Wednesday ====
* [[Administrative Professionals' Day]] ([[South Africa]])

==== First Thursday ====
* [[Engineer's Day]]s ([[Tanzania]])

==== First Friday ====
* [[Engineer's Day]]s ([[Tanzania]])
* [[Public holidays in the Marshall Islands|Labor Day]] ([[Marshall Islands]])
* [[Teachers' Day]] ([[Singapore]])

==== First Sunday ====
* [[Brazilian Day]] ([[International observance]])
* [[Father's Day]] ([[Australia]], [[Fiji]], [[New Zealand]], [[Papua New Guinea]])
* [[Memorial of the Holy Guardian Angels]] ([[Roman Catholic Church]], October 2 in most locations, first Sunday in September by special dispensation)

==== First Sunday after September 4 ====
* [[Wakes Week]] (Parts of [[England]] and [[Scotland]])
** [[Abbots Bromley Horn Dance]] ([[Abbots Bromley]], [[Staffordshire]], [[England]])

==== Week of the first Monday ====
* [[National Payroll Week]] ([[United States]], [[Canada]], [[United Kingdom]])

==== Week of September 10 ====
* [[National Suicide Prevention Week]] ([[United States]])

==== First Monday ====
* [[Labour Day]] ([[Canada]], [[Palau]], [[United States]])

==== Nearest weekday to September 12 ====
* [[Battle of Saragarhi#Saragarhi Day|Saragarhi Day]] ([[Sikhism]])

==== Second Saturday ====
* [[Public holidays in Turkmenistan|Day of the Workers in the Oil, Gas, Power, and Geological Industry]] ([[Turkmenistan]])

==== Saturday after first Monday ====
* [[Carl Garner Federal Lands Cleanup Day]] ([[United States]])

==== Second Sunday ====
* [[Scientology holidays|Auditor's Day]] ([[Church of Scientology]])
* [[Father's Day]] ([[Latvia]])
* [[National Grandparents' Day]] ([[Canada]], [[Estonia]])
* [[Public holidays in Russia#Popular holidays which are not public holidays|Tanker's Day]] ([[Russia]])
* [[Public holidays in Turkmenistan|Turkmen Bakhshi Day]] ([[Turkmenistan]])

==== First Sunday after first Monday ====
* [[National Grandparents' Day]] ([[United States]])

==== Week of September 17 ====
* [[Celebrate Freedom Week]] ([[Kansas]] and [[Texas]], [[United States]])

==== Third Tuesday ====
* [[Prinsjesdag]] ([[Netherlands]])

==== September 17 but observed on previous Friday if it falls on a Saturday or following Monday if on a Sunday ====
* [[Constitution Day and Citizenship Day]]

==== Third Friday ====
* [[National POW/MIA Recognition Day]] ([[United States]])
[[File:United States POW-MIA flag.svg|thumb|POW☆MIA Flag.]]
==== Third Saturday ====
* [[National Cleanup Day]] (United States)
* [[Oktoberfest celebrations]] begin ([[German diaspora]], local dates may vary)
* [[Software Freedom Day]] ([[International observance]])

==== Weekend of the week of September 17 ====
* [[Von Steuben Day]] ([[United States]])

==== Third Sunday ====
* [[Day of the Walloon Region]] ([[Wallonia]], [[Belgium]])
* [[Father's Day]] ([[Ukraine]])
* [[Federal Day of Thanksgiving, Repentance and Prayer]] ([[Switzerland]])
* [[Warachikuy]] ([[Cusco]], [[Peru]])

==== Week of Sunday before September 23 ====
* [[List of LGBT holidays|Bisexual Awareness Week]]

==== Week of September 22 ====
* [[Hobbit Day|Tolkien Week]]

==== Last week ====
* [[Banned Books Week]] ([[International observance]]):

==== Last full week ====
* [[National forest week|National Forest Week]] ([[Canada]])
** [[Arbor Day#Canada|National Tree Day]] (Wednesday of last full week):
* [[Celebrate Freedom Week]] ([[Arkansas]] and [[Florida]], [[United States]])

==== Third Monday ====
* [[Respect for the Aged Day]] ([[Japan]])

==== Pertaining to the [[September Equinox]] ====
* [[Autumnal Equinox Day]] ([[Japan]])
** [[French Republican Calendar|French Republican]] New Year. (defunct)
* [[Guldize]] ([[Cornish people]])
* [[Higan]] ([[Japan]])
* [[Wheel of the Year#Autumn Equinox (Mabon)|Mabon]] ([[Neopaganism]], [[Northern Hemisphere]])
* [[Miķeļi]] ([[Latvia]])
* [[Wheel of the Year#Spring Equinox (Ostara)|Ostara]]  ([[Neopaganism]], [[Southern Hemisphere]])

==== Fourth Friday ====
* [[Native American Day]] ([[California]], [[United States]])

==== Last Friday ====
* [[Public holidays in the Marshall Islands|Manit Day]] ([[Marshall Islands]])

==== Last Saturday ====
* [[Women in Aviation, International#Girls in Aviation Day|Girls in Aviation Day]] ([[International observance]])
* [[National Public Lands Day]] ([[United States]])

==== Last Sunday ====
* [[Daylight saving time]] begins ([[New Zealand]])
* [[Gold Star Mothers Club|Gold Star Mother's Day]] ([[United States]])

==== Fourth Monday ====
* [[American Indian Day]] ([[Tennessee]], [[United States]])
* [[September Declaration]] ([[Flanders]], [[Belgium]])

==== Last Wednesday ====
* [[Arbor Day#Canada|Maple Leaf Day]] ([[Canada]])

==== Last weekday ====
* [[Ask a Stupid Question Day]] ([[India]], [[United Kingdom]], [[United States]])