August 9 - International Day of the World's Indigenous People

The term indigenous peoples can be used to describe any ethnic group of people who inhabit a geographic region with which they have the earliest known historical connection, alongside immigrants which have populated the region and which are greater in number.
On 23 December 1994, the General Assembly decided that the International Day of the World’s Indigenous People shall be observed on 9 August every year during the International Decade of the World’s Indigenous People (resolution 49/214).
Links:
1.UN Page