21 March 1966
The International Day for the Elimination of Racial Discrimination was first proclaimed a United Nations’ Day of observance in 1966. The day was inspired by events that took place six years earlier, when police shot and killed 69 people at a peaceful demonstration in Sharpeville, South Africa. The Sharpeville Massacre is also observed as Human Rights’ Day locally. The theme for The International Day for The Elimination of Racial Discrimination is “Racism and Sport”
References

United Nations, 'International Day for the Elimination of Racial Discriminatio', [online] Available at: www.un.org  [Accessed: 18 March 2014]|Time and Date, 'International Day for the Elimination of Racial Discrimination', [online] Available at: www.timeanddate.com [Accessed: 18 March 2014]