14 December 1990
The African National Congress (ANC) held its first Consultative Conference in South Africa after thirty-one years from 14-16 December 1990. It was considered by the ANC as ranking in importance with such historic moments as the Congress of the People convened in June 1955; the Defiance Campaigns of 1952 and 1989; the launching of the United Democratic Front in 1983; and the release of Nelson Mandela on 11 February 1990.
References

Kalley, J.A.; Schoeman, E. & Andor, L.E. (eds)(1999). Southern African Political History: a chronology of key political events from independence to mid-1997, Westport: Greenwood.