June 1995, she travelled to Moscow. She paid a visit to a children's hospital she had previously supported when she provided them with medical equipment. In Moscow, she received the International Leonardo Prize, which is given to "the most distinguished patrons and people in the arts, medicine, and sports". In December 1995, Diana received the United Cerebral Palsy Humanitarian of the Year Award in New York City for her philanthropic efforts. In October 1996, for her works on the elderly, she was awarded a gold medal at a health care conference organised by the Pio Manzù Centre in Rimini, Italy. The day after her divorce, she announced her resignation from over 100 charities and retained patronages of only six: Centrepoint, English National Ballet, Great Ormond Street Hospital, The Leprosy Mission, National AIDS Trust, and the Royal Marsden Hospital. She continued her work with the British Red Cross Anti-Personnel Land Mines Campaign, but was no longer listed as patron. In May 1997, Diana opened the Richard Attenborough Centre for Disability and the Arts in Leicester, after being asked by her friend Richard Attenborough. In June 1997 and at the suggestion of her son William, some of her dresses and suits were sold at Christie's auction houses in London and New York, and the proceeds that were earned from these events were donated to charities. Her final official engagement was a visit to Northwick Park Hospital, London, on 21 July 1997. Her 36th and final birthday celebration was held at Tate Gallery, which was also a commemorative event for the gallery's 100th anniversary. She was scheduled to attend a fundraiser at the Osteopathic Centre for Children on 4 September 1997, upon her return from Paris. HIV/AIDS Diana began her work with AIDS patients in the 1980s. She was not averse to making physical contact with AIDS patients, and was the first British royal figure to do so. In 1987, she held hands with an AIDS patient in one of her early efforts to de-stigmatise the condition. Diana noted: "HIV does not make people dangerous to know. You can shake their hands and give them a hug. Heaven knows they need it. What's more, you can share their homes, their workplaces, and their playgrounds and toys." To Diana's disappointment, the Queen did not support this type of charity work, suggesting she get involved in "something more pleasant". In 1989, she opened Landmark Aids