...when South Africans celebrate the diverse cultural heritage that makes up a rainbow nation. It is the day to celebrate the contribution of all South Africans to the building of South Africa(sic) — Lowry 21:1995.Heritage Day is a South African public holiday celebrated on 24 September.On this day, South Africans across the spectrum are encouraged to celebrate their culture and the diversity of their beliefs and traditions, in the wider context of a nation that belongs to all its people.outh Africans celebrate Heritage Day by remembering the cultural heritage of the many cultures that make up the population of South Africa. Various events are staged throughout the country to commemorate this day.