Organisers of the two-day national convention which begins at the Sandton Convention Centre on Saturday morning say it has been oversubscribed by 2 300 people - and more are still expected.
About 4 500 delegates were expected but so far the event has been oversubscribed by 2 300 people, a figure organisers said was likely to increase.
The additional people were made up of delegates who had arrived in Johannesburg from various provinces without having pre-registered.
Organisers said an overflow area was set up at the Johannesburg stadium for people who did not have accreditation to attend the convention.
A live video feed has been set up for members of the public to watch proceedings of the convention.
Organisers said accommodation problems had been caused by the unregistered delegates and members of the public arriving and having no where to stay.
Proceedings at the accreditation station were also delayed as staff dealt with queries from those who had not registered. - Sapa