– Amnesty International staged the fourth of its Secret Policeman's Ball benefits. The show titled The Secret Policeman's Other Ball was staged in London over four consecutive nights. This show expanded on its 1979 predecessor with appearances by multiple rock musicians including Sting, Eric Clapton, Jeff Beck, Phil Collins, Donovan and Bob Geldof. Nuclear Disarmament Rally (1982) June 12, 1982 – In New York City, 750,000 people marched from the UN to Central Park to protest nuclear weapons – in what was probably the largest single protest in U.S. history. NYC was shut down for the day. The concert featured artists including Jackson Browne, Linda Ronstadt, and Bruce Springsteen. Keith Haring created a poster for the event, which was handed out free to the audience. Live Aid (1985) July 13, 1985 – The Live Aid benefit concerts – conceived and organised by Bob Geldof and Midge Ure – took place in London and Philadelphia. Similar concerts were held in Sydney and Moscow. Farm Aid (1985) September 22, 1985 – The first Farm Aid concert, organised by Willie Nelson and John Mellencamp to raise money for family farmers in the United States, was held in Champaign, Illinois. There have been 19 Farm Aid concerts as of 2007. Self Aid (1986) May 17, 1986 – The Self Aid concert held in Dublin, Ireland, aimed to highlight the chronic unemployment problem in Ireland at the time. Performers at the event included U2, Van Morrison and The Pogues. Conspiracy of Hope US Tour (1986) June 4–15, 1986 – The Conspiracy of Hope US tour of six rock concerts for Amnesty International. Performers included U2, Sting, Joan Baez, Lou Reed, Jackson Browne, The Neville Brothers and, at the final three concerts, a reunion of The Police. Heart Beat 86 (1986) March 15, 1986 – The Heart Beat 86 concert was held near Birmingham England to raise money for the Birmingham Children's Hospital. Human Rights Now! World Tour (1988) September 2 – October 15, 1988 The Human Rights Now! World tour of rock concerts for Amnesty International The Wall – Live in Berlin (1990 July 21) Roger Waters (Memorial Fund for Disaster Relief) A live concert performance by Roger Waters and numerous guest artists, of the Pink Floyd studio album The Wall, itself largely written by Waters during his time with the band. The show was held in Berlin on 21 July 1990, to commemorate the