JOHANNESBURG, South Africa - An eclectic mix of world leaders including President Obama and Cuban President Raul Castro will eulogize Nelson Mandela before a crowd of nearly 100,000 mourners at a massive memorial service Tuesday in the World Cup soccer stadium where the anti-apartheid champion made his last public appearance.

"What a fantastic gift God gave to us in this Mandela, who quickly became an icon, a global icon of forgiveness, of generosity of spirit," Archbishop Desmond Tutu told a gathering Monday at the Nelson Mandela Centre of Memory.

"He really was like a magician with a magic wand, turning us into this glorious, multicolored, rainbow people."

Nearly 100 world leaders and tens of thousands of South Africans of all races and backgrounds were expected to pay their respects to the man who bridged this nation's black-white divide at the FNB stadium in Soweto - a locale heavy in symbolism as the black township that was at the center of the violent struggle against apartheid.

The 95,000-capacity soccer venue was also the spot where Mandela made his last public appearance at the closing ceremony of the 2010 World Cup. His body will then lie in state for three days at the Union Buildings in Pretoria - once the seat of white power - before burial Sunday in his rural childhood village of Qunu in Eastern Cape Province.

South African authorities rushed Monday to deal with the complex security, logistical, and protocol challenges of hosting what promised to be one of the largest and most prominent gatherings of world dignitaries in generations.

Besides Obama and first lady Michelle Obama, former Presidents George W. Bush, Bill Clinton and Jimmy Carter were to attend Tuesday's memorial, along with Laura Bush and former Secretary of State Hillary Rodham Clinton.

At the stadium, workers busily constructed a stage protected by bulletproof glass and police promised thousands of officers would secure the stadium. Still, security appeared lax Monday as the owner of a private security company scrambled to hire guards for Tuesday's event, using his car as a mobile office.

George Mathabe, manager of the Sidas security company, said 1,500 guards would be on duty Tuesday.

"I'm doing this from the bottom of my heart, just to thank Tata," Mathabe said, using the Xhosa word for father as an endearment for Mandela, who died Thursday at the age of 95.

"My son is coming tomorrow as a visitor too. He's going to live in a free country. He's going to be able to do whatever he likes, thanks to Tata."

Mourners were already camped out Monday to be the first ones inside the Soweto stadium, where roads were to be closed for several square miles Tuesday. Officers will direct traffic, protect mourners and assist the bodyguards of visiting dignitaries, said Lt. Gen. Solomon Makgale, a spokesman for the South African Police Service.

"We will be on hand to make sure people are able to grieve in a safe environment," Makgale said.

Mandela Memorial Service

The memorial service Tuesday for Nelson Mandela will be held at FNB Stadium in Soweto Township near Johannesburg. It is due to start at 11 a.m. (4 a.m. Philadelphia time) and will last for four hours, according to a program released Monday by the South African government.

Here's a look at some of the scheduled events and speeches in chronological order:

Choir sings South Africa's national anthem.

Opening remarks and interfaith prayers.

Speech by Mandela family friend Andrew Mlangeni.

Speech by family member Gen. Thanduxolo Mandela.

Tribute by the former leader's grandchildren Mbuso Mandela, Andile Mandela, Zozuko Dlamini, and Phumla Mandela.

Speeches

U.N. Secretary-General Ban Ki-moon.

African Union Commission Chairwoman Nkosazana Dlamini Zuma.

President Obama.

Brazilian President Dilma Rousseff.

Chinese Vice President Li Yuanchao.

Namibian President Hifikepunye Pohamba.

Indian President Pranab Mukherjee.

Cuban President Raul Castro.

Keynote address

South African President Jacob Zuma.

Sermon

Bishop Ivan Abrahams.

- AP

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