SEPTEMBER

   
1st

Christianity - Eastern (Byzantine) Catholic Church, the new Liturgical Year (Indiction) also begins. 

Cameroon - Jour d'Union Nationale Camerounaise. 

Libya - Revolution Day  

Russia - Knowledge Day. 

Singapore - Teachers' Day. 

Slovakia - Constitution Day. 

Uzbekistan - Independence Day (from USSR, 1991). 

2nd

Hinduism - Ganesh Chaturthi. 

Transnistria - Independence day, note Transnistria is not an internationally recognized independent state. 

Sedan Day (Sedantag) - traditional national German holiday (see Sedan, France) that commemorates Prussia's victory over France in 1870, making the German Empire a reality. 

Vietnam - National Day (independence from Japan and France, 1945). 

3rd

Qatar - Independence Day (from Great Britain.) 

San Marino - Foundation by Saint Marinus. 

Australia - Flag Day. 

Tunisia - Memorial Day 

4th

Hinduism - Krishna Janmaashtami

5th

India - The birthdate of Sarvepalli Radhakrishnan is celebrated as Teacher's Day in India.

6th

Bulgaria – Unification Day. 

Pakistan – Defence Day (Pak-Army Day) 

Swaziland – Independence Day 

7th

Brazil - Independence day

Turkey - Independence day 

Pakistan - Defence Day (Pak-Air-Force Day) 

Mozambique - Victory Day 

8th

Brazil - The Foundation Day

Andorra - National day: Mare de Deu de Meritxell. 

Pakistan - Defence Day (Pak-Naval Day) 

Bahá'í Faith - Feast of 'Izzat (Might) 

Republic of Macedonia - Independence day 

Malta - Feast of Our Lady of Victories (il-Vittorja); anniversary of the 1565 victory of the Knights of Malta over the Ottoman Empire; 

9th

Japan - Chrysanthemum Day (Kiku no Sekku). 

North Korea - Republic Day

Tajikistan - Independence Da

10th

Gibraltar - National Day. 

China - Teacher's Day

11th

Christianity - Feast of Neyrouz, the New Year's Day in the Coptic calendar. 

Ethiopia - New Year's Day in the Ethiopian calendar (Enkutatash). 

Catalonia - National Day. 

Latin America - Latin America Teacher's Day, after the death of Argentine Domingo F. Sarmiento. 

Pakistan - Death anniversary of Muhammad Ali Jinnah, founder of Pakistan. 

United States - Patriot Day - Anniversary of the September 11 attacks. 

12th

Cape Verde - National Day. 

Ethiopia - National Revolution Day 

Mexico - Commemoration of the mass hanging of the Saint Patrick's Battalion. 

16th

Mexico - Independence Day 

Papua New Guinea - Independence Day

17th

Angola - National Heroes' Day. 

Netherlands - Operation Market Garden is still remembered with parachuting and dedications on this day. 

18th

Chile - Independence Day

19th

Chile - Armed Forces Day. 

Saint Kitts and Nevis - Independence Day

20th

Malta, Belize, and Armenia - Independence Day

Mabon - Neopagan festival of Mabon 

22nd

Bulgaria - Independence Day (from The Ottoman Empire) 

Mali - Independence Day 

23rd

Christianity - Traditional New Year's Day in Constantinople and Eastern Orthodox Churches — because of the birthday of Augustus, not because of the equinox. 

Saudi Arabia - National Day

24th

Guinea-Bissau - Independence Day 

New Caledonia - Territorial Day. 

England - Our Lady of Walsingham. 

South Africa - Heritage Day. 

Spain - La Mercè the festival for Barcelona's patron saint. A lot of art and musical activities. 

Trinidad and Tobago - Republic Day  

27th

Ethiopian Orthodox Church - Meskel. 

Bahá'í Faith - Feast of Mashíyyat (Will) 

28th

Czech Republic - Czech Statehood Day

29th

Christianity - Michaelmas - Christian feast of the Archangels St. Michael, St. Gabriel, and St. Raphael. 

Argentina - Inventor's Day - László József Bíró's birthday. 

30th

Botswana - Independence Day

São Tomé and Príncipe - Nationalization Day