From https://www.un.org/en/observances/happiness-day
What is the International Day of Happiness?
It’s a day to be happy, of course! Since 2013, the United Nations has celebrated the International Day of Happiness as a way to recognise the importance of happiness in the lives of people around the world.
Happiness is a fundamental human goal. The United Nations General Assembly recognizes this goal and calls for “a more inclusive, equitable and balanced approach to economic growth that promotes the happiness and well-being of all peoples.”
In 2015, the UN launched the 17 Sustainable Development Goals, which seek to end poverty, reduce inequality, and protect our planet – three key aspects that lead to well-being and happiness.
The United Nations invites each person of any age, plus every classroom, business and government to join in celebration of the International Day of Happiness.