European Mushroom Day

World Environmental Health Day on September 26;

European Researchers' Night on September 26;

European School Sports Day on September 26 (the last Friday of Septembe);

European Day of Languages on September 26 (European Union);

National Organ and Tissue Donation and Transplantation Day in Mexico on September 26;

International Rabbit Day on September 27 (Held on the fourth Saturday in September);

Astronomy Day on September 27 (autumn);

European Myeloma Day on September 27;

National Gay Men's HIV/AIDS Awareness Day on September 27 (United States);

National Day of the Deaf in El Salvador on September 27 (Día Nacional de la Persona Sorda);

Donor Day in Chile on September 27;

Dentist's Day in Chile on September 27;

National Crush Day in USA on September 27 (It’s a reminder that recycling reduces carbon emissions, saves money, and cuts down on waste. National Crush Day is an opportunity for those who care about the environment to advocate for recycling);

National Public Lands Day in USA on September 27 (Held on the fourth Saturday in September);

National Environmental Awareness Day in Argentina on September 27;

International Safe Abortion Day on September 28 (The day was first celebrated as a day of action for decriminalization of abortion in Latin America and the Caribbean in 1990 by the Campaña 28 Septiembre);

International Right to Know Day on September 28;

World Rivers Day on September 28 (last Sunday of September);

World Retina Day on September 28 (Held on the last Sunday in September);

International Day for Universal Access to Information on September 28 (Universal access to information means that everyone has the right to seek, receive and impart information. This right is an integral part of the right to freedom of expression);

International Poke Day on September 28;

World Marmite Day on September 28;

International Daughters' Day on September 28 (Celebrated on the fourth Sunday of September);

Bladder Cancer Awareness Walk in Canada on September 28 (This charity event began in 2006. It takes place every year on the fourth Sunday in September);