Created by the World Heart Federation, World Heart Day informs people around the globe that CVD, including heart disease and stroke, is the world's leading cause of death claiming 18.6 million lives each year, and highlights the actions that individuals can take to prevent and control CVD.

Every year on September 24, India celebrates National Service Scheme Day (NSS Day). During Mahatma Gandhi's Centenary Year (1969), on September 24, the National Service Scheme (NSS) was inaugurated, including 40,000 student volunteers from 37 institutions.

World Rose Day, a day dedicated to cancer patients is observed every year on 22 September. World Rose Day is observed every year in different parts of the world on 22 September. ... The taxing nature of the treatment makes things very difficult for many patients and their caregivers.

World Alzheimer's Day is observed on September 21, every year to raise awareness, educate about Alzheimer's and Dementia. This day is celebrated to understand the importance of talking about dementia and demystify it. Alzheimer's is a progressive disease that causes brain cells to degenerate and die.

September 16 was designated by the United Nations General Assembly as the International Day for the Preservation of the Ozone Layer. This designation had been made on December 19, 2000, in commemoration of the date, in 1987, on which nations signed the Montreal Protocol on Substances that Deplete the Ozone Layer.

In 2007 the United Nations General Assembly resolved to observe 15 September as the International Day of Democracy—with the purpose of promoting and upholding the principles of democracy—and invited all member states and organizations to commemorate the day in an appropriate manner that contributes to raising public awareness.

The National Sports Day in India is celebrated on 29 August, on the birth anniversary of hockey player Major Dhyan Chand.This day marks the birthday of Major Dhyan Chand Singh, the hockey player who won gold medals in Olympics for India in the years 1928, 1932 and 1936. He scored 570 goals in his career, from 1926 to 1949.

Women's Equality Day is celebrated in the United States on August 26 to commemorate the 1920 adoption of the Nineteenth Amendment (Amendment XIX) to the United States Constitution, which prohibits the states and the federal government from denying the right to vote to citizens of the United States on the basis of sex.

Independence Day is celebrated annually on 15 August as a national holiday in India commemorating the nation's independence from the United Kingdom on 15 August 1947, the day when the provisions of the 1947 Indian Independence Act, which transferred legislative sovereignty to the Indian Constituent Assembly, came into effect.

Hiroshima was the first city targeted by a nuclear weapon. This occurred on August 6, 1945 at 8:15 a.m., when the United States Army Air Forces (USAAF) dropped the atomic bomb "Little Boy" on the city.