"This programme will involve all levels of the organisation in a decisive and concerted campaign to mobilise across society to address this crisis," the African National Congress said in a statement.

ANC leader Jacob Zuma will speak in Springs, east of Johannesburg, one of the flashpoints for a wave of anti-migrant riots that began two weeks ago.

Winnie Madikizela-Mandela, who is the former wife of Nelson Mandela, will speak at a separate meeting. Cyril Ramaphosa and Toyko Sexwale, who are prominent businessmen as well as ANC members, were scheduled to appear at other events.

The campaign was expected to draw community activists and members of the public.

President Thabo Mbeki, who lost the ANC leadership to Zuma last year, is scheduled to address the nation later on Sunday -- for the first time since the attacks began.

The ANC government has been criticised for its slow reaction to the unrest, the worst since apartheid ended 14 years ago, and for not adequately addressing the poverty widely blamed for sparking the bloodshed.

Police said shantytowns throughout the country were relatively peaceful overnight.

"We had a quiet evening last night with no reports of serious violence. The violence is cooling down now," said Andre Traut, a spokesman for police in the Western Cape province, which includes Cape Town.

Traut said large numbers of migrants had already fled into makeshift refugee camps, where they are being provided blankets, food and clothing.

More than 25,000 have been driven from their homes across the nation by mobs who have stabbed, clubbed and burnt migrants, whom they accuse of taking jobs and fuelling crime. The violence started in the Alexandra township in Johannesburg on May 11.

Police, backed by the military, were continuing to monitor trouble spots, especially in shantytowns around Johannesburg. Earlier this week Mbeki authorised the army to help quell the violence.

The crisis comes amid power shortages and growing discontent that has rattled investor confidence in Africa's biggest economy.

Officials in the tourism industry, one of the cornerstones of the economy, are worried that overseas visitors will delay or cancel trips to the country, which is scheduled to host the 2010 soccer World Cup. An estimated half a million extra tourists are expected to visit South Africa for the championship.