JOHANNESBURG, South Africa — Nelson Mandela's fans celebrated the anti-apartheid icon's 91st birthday Saturday by emulating him with good deeds, reading to the blind, distributing blankets to the homeless or refurbishing homes for AIDS orphans.

Mandela has called on people to spend time doing good Saturday, the first Mandela Day, which his charity foundations hope will be an annual event.

In South Africa, people are collecting clothing for poor children, painting schools, planting trees near Mandela's boyhood home in eastern South Africa, and renovating a building in downtown Johannesburg for people left homeless by a fire.

Mandela stepped down after serving one term as president — the first black South African to hold the post. Since 1999, he has devoted himself to such causes as fighting AIDS and poverty and championing the rights of children.

At a Mandela Day concert in New York on Saturday, Stevie Wonder, Alicia Keys, Aretha Franklin and others are slated to perform for the benefit of Mandela's AIDS foundation.

Mandela Day organizers encouraged people to devote at least a minute for each of the 67 years Mandela campaigned against apartheid to community service