World Algae Day

National Sausage Pizza Day in USA on October 11;

Arequipe Day in Colombia on October 11;

Dulce de Leche Day in Argentina on October 11;

International Vet Nurse Day on October 11 (Held on the second Friday of October);

International Newspaper Carrier Day on October 11 (Held on the second Friday in October);

Arbor Day in Namibia on October 11 (Held on the second Friday of October);

National Gumbo Day and Cookbook Launch Day in USA on October 12;

International Pinotage Day on October 12 (Celebrated on the second Saturday of October);

International Newspaper Carrier Day on October 12 (Held on the Saturday of the first full week of October);

World Bone and Joint Week on October 12;

World Economist Day on October 12 (the day when outstanding representatives of the profession are awarded a prize by decision of the Nobel Committee);

Fall World Migratory Bird Day on October 12 (Held on the second Saturday of May and October with the support of the United Nations Environment Program - UNEP);

European Day for Organ Donation and Transplantation on October 12 (The European Day for Organ Donation and Transplantation (#EODD; takes place to raise awareness on the importance of organ, tissue and cell donation as a way to improve and save lives);

International Day Against DRM on October 12 (IDAD, Inaugurated 2006);

Astronomy Day on October 12 (autumn);

National Peanut Festival, National Pumpkin Festival, Yorkshire Pudding Day and National M&M Day in USA on October 13;

Salvadoran Gastronomy Day on October 13 (Día de la gastronomía salvadoreña. Ñelebrated since 2015);

International Suit Up Day on October 13;

International Skeptics Day on October 13;

World Thrombosis Day on October 13;