Jinnah, a former holiday. (Pakistan) Emergency Number Day (United States) Enkutatash falls on this day if it is not a leap year.(Ethiopia, Rastafari) National Day of Catalonia (Catalonia) National Hot Cross Bun Day (United States) Nayrouz (Coptic Orthodox Church) Patriot Day (United States) Remember Freedom Day Teachers' Day (Argentina) September 12 Most Holy Name of the Blessed Virgin Mary Day of Conception (Russia) Day of the Programmer, during a leap year. (International) Defenders Day (Maryland. (United States) Enkutatash falls on this day if it is a leap year. (Ethiopia, Rastafari) Mindfulness Day National Chocolate Milkshake Day (United States) National Day (Cape Verde) National Day of Encouragement (United States) Saragarhi Day (Sikhism) (this day or nearest weekday, 2015 date: September 11) September 13 Day of the Programmer, during a non-leap year. (International) Feast of the Cross (Assyrian Church of the East) Día de los Niños Héroes (Mexico) Engineer's Day (Mauritius) International Chocolate Day National Peanut Day (United States) September 14 Children's Day (Nepal) (celebrated on the 15th on leap years) Engineer's Day (Romania) Feast of the Cross (Christianity) Elevation of the Holy Cross (Eastern Orthodox) Hindi Diwas (Hindi-speaking regions) Mobilized Servicemen Day (Ukraine) National Cream Filled Donut Day (United States) National Eat a Hoagie Day (United States) San Jacinto Day (Nicaragua) September 15 Battle of Britain Day (United Kingdom) Children's Day (Nepal) (leap years only) Engineer's Day (India) Free Money Day (International) Independence Day (Guatemala, El Salvador, Honduras, Nicaragua, and Costa Rica) International Day of Democracy (International) Knowledge Day (Azerbaijan) National Crème de Menthe Day (United States) National Double Cheeseburger Day (United States) National Linguine Day (United States) National Cheese Toast Day (United States) Patriotic Day (Guatemala) Restoration of Primorska to the Motherland Day (Slovenia) Silpa Bhirasri Day (Thailand). World Lymphoma Awareness Day The beginning of National Hispanic Heritage Month, celebrated until October 15 (United States) September 16 Grito de Dolores (Mexico) Independence Day (Papua New Guinea), celebrates the independence of Papua New Guinea from Australia in 1975. International Day for the Preservation of the Ozone Layer Malaysian Armed Forces Day (Malaysia) Malaysia Day (Malaysia, Singapore) Martyrs' Day (Libya) Heroes' Day (Saint Kitts and Nevis) National Cinnamon Raisin Toast Day (United States) National Guacamole Day (United States) Stay Away from Seattle Day September 17 Australian Citizenship Day Constitution Day (United States) (observed on the previous Friday if it falls on a Saturday, the following Monday if on a Sunday) Start of