From Zapiro.com: 

"On 10 September 1999 approximately 600 children from around the country and who were members of the Field Band Foundation (the Foundation), an organisation that provides facilities and instruments for young people to play in musical bands, were engaged to perform at the opening ceremony of the All Africa Games at the Johannesburg Stadium. They assembled in the parking area of the stadium at ap proximately 10h00. The organiser of the Foundation, Ms Retha Cilliers, had made prior arrangements with a caterer  to serve two meals to the children, lunch between 12 noon and 13h30 and supper. However, lunch, consisting of beef stew and maize meal porridge (‘pap’), was only served at 15h00. A fruit juice in unmarked plastic containers was also supplied. When the caterer ran out of beef stew, pieces of chicken were served. A large number of the children took ill within an hour of having consumed the meal. They experienced nausea, stomach cramps and vomiting".