Teachers' Day is a special day for the appreciation of teachers, and may include celebrations to honor them for their special contributions in a particular field area, or the community in general.

World Post Day is an international day that happens each year on October 9, the anniversary of the Universal Postal Union, which started in 1874 in Switzerland. The UPU was the start of the global communications revolution, introducing the ability to write letter to others all over the world.

World Mental Health Day is an international day for global mental health education, awareness and advocacy against social stigma. It was first celebrated in 1992 at the initiative of the World Federation for Mental Health, a global mental health organization with members and contacts in more than 150 countries.

Global Handwashing Day is an international handwashing promotion campaign to motivate and mobilize people around the world to improve their handwashing habits. Washing hands at critical points during the day and washing with soap are both important. Global Handwashing Day occurs on 15 October of each year.

This public holiday in Sri Lanka takes place on the full moon day of Vap, the seventh month in the Sinhalese calendar. It usually falls in October in the Western calendar. The festival Marks Buddha's preaching of Abhidamma to the gods in Tavatimsa and the end of the Buddhist period of fasting

Halloween traces its roots to the pre-Christian Celtic festival of Samhain, which was celebrated on the night of Oct. 31. The ancient Celts believed the dead returned to earth on Samhain and would celebrate with bonfires and other practices to honor the deceased.

World Tsunami Awareness Day is celebrated to create awareness about this deadly disaster which has claimed more than 260,000 lives, surpassing any other natural hazard in the past 100 years. The highest number of deaths took place in the Indian ocean at the time of the tsunami in December 2004