Oprah Winfrey, Julia Roberts to appear in global live stream

This combination photo shows, top row from left, media mogul Oprah Winfrey, former President George W. Bush, actress Julia Robert and musician Yo-Yo Ma, bottom row from left, guru Deepak Chopra, rapper Common, musician Questlove, and actress Jennifer Garner, who are among the participants in the 24-hour livestream event, The Call to Unite, beginning Friday, May 1 at 8 p.m. EDT. (AP Photo)

LOS ANGELES — Oprah Winfrey, Julia Roberts and President George W. Bush will be among 200 star-studded participants in a 24-hour global livestream event.

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