World Kindness Day is an international observance on 13 November. It was introduced in 1998 by the World Kindness Movement, a coalition of nations' kindness NGOs. It is observed in many countries, including Canada, Australia, Nigeria and the United Arab Emirates. Singapore observed the day for the first time in 2009.
This article from the British Council explains how people celebrate World Kindness Day by being kind and having fun. It also mentions the use of "kindness cards", which are small cards that people give to each other after performing a kind act. 
This article from the British Council explains how people celebrate World Kindness Day by being kind and having fun. It also mentions the use of "kindness cards", which are small cards that people give to each other after performing a kind act. World Kindness Day is celebrated annually on November 13. It was established in 1998 by the World Kindness Movement, a coalition of international NGOs.