From the Live Aid Wikipedia page:
Live Aid was a dual-venue benefit concert held on 13 July 1985, and an ongoing music-based fundraising initiative. The original event was organised by Bob Geldof and Midge Ure to raise funds for relief of the ongoing Ethiopian famine. Billed as the "global jukebox", the event was held simultaneously at Wembley Stadium in London, England, United Kingdom (attended by 72,000 people) and John F. Kennedy Stadium in Philadelphia, Pennsylvania, United States (attended by about 100,000 people).
On the same day, concerts inspired by the initiative happened in other countries, such as the Soviet Union, Canada, Japan, Yugoslavia, Austria, Australia and West Germany. It was one of the largest-scale satellite link-ups and television broadcasts of all time; an estimated global audience of 1.9 billion, across 150 nations, watched the live broadcast. If accurate, this would be nearly 40% of the world population at the time.
See some of the iconic moments.. Dire Straits & Sting.. Queen.. founder Bob Geldof and the Philly finale of We Are The World.. and see more memories on Twitter!