Today's event has become an important annual fundraising event for Sentebale, an organisation which works with children in Lesotho and Botswana who are coming to terms with being HIV positive, have Aids or have lost their parents to the disease.
Their aim was to help youngsters in need and other children who had lost one or both parents to Aids or contracted the disease themselves.
In November 2015 Sentebale opened its £2 million Mamohato Children's Centre in Lesotho to scale up its Mamohato camps, a residential project providing psychological, social and practical support to children struggling to cope with being HIV positive.
Harry arrived in a smart casual outfit of jacket and trousers and a shirt without a tie, and was greeted by Sentebale chief executive Cathy Ferrier and Nacho Figueras, a professional polo player and Sentebale ambassador.
Harry and his brother Prince William, have taken part in polo fixtures since 2007 to raise money for charity, bringing in £10 million.
The quiet room sprang to life with people talking and Harry reached for a date and popped into his mouth then licked his fingers.
A few minutes later he tucked in to a small bowl of porridge, known as bubur, as he sat at a table with other guests.
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Minutes before the sun went down and the call to prayer was made by an Islamic scholar, Muhammad Rafiuddin Ismail, secretary-general of Jamiyah, said: 'Our thoughts go out to the families of the victims of the London terror attack last night.'Harry bowed his head as he began speaking and the secretary general added: 'Let peace and harmony prevail in communities all over the world.'Later this week, Harry will arrived in Sydney to attend events to celebrate the city's hosting of the 2018 Invictus Games, the international sporting competition for wounded, injured and sick service personnel and veterans founded by the prince in 2014.