31 August, 2017
Harry and William, joined by his wife Kate Middleton, Duchess of Cambridge, visited the Sunken Garden in Kensington Palace, a place Diana was fond of before she died.
Candles, bouquets of flowers and pictures from well-wishers are already building up at the palace gates, while hardcore Diana fans have turned up with a cake bearing her picture.
It is a more muted affair than in 1997, when a sea of flowers formed outside the gates after Diana's death.
"The engagement will allow the Princes to pay tribute to the life and work of their mother the day before the twentieth anniversary of her death", an earlier statement from Kensington Palace said.
William and Harry will also meet representatives from the charities supported by Diana in the final years of her life, including Great Ormond Street Hospital, the National Aids Trust, The Leprosy Mission, Royal Marsden Hospital, English National Ballet and Centrepoint.
Diana died in a auto crash in Paris in the early hours of August 31, 1997, along with Dodi Fayed, her wealthy Egyptian film producer boyfriend of two months, and a drink-impaired, speeding driver Henri Paul, who was trying to evade paparazzi.
Using a step-ladder, Maria Scott from Newcastle arranged a large banner on the gates, which read "Diana, Princess of Wales; forever in our hearts".
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"She was a very special person", he said.
Jason, whose father is from the United Kingdom, says he remembers Diana as "very glamorous - but with a mischievous side", and says he feels it is important to remember the princess for her charity work. "I said in the middle under the HRH on a poster".
Huddled under an umbrella with a bunch of sunflowers is Kareen, a teaching assistant from Tonbridge in Kent, who along with her partner Paul, from east London, recently laid tributes to Diana in Paris.
In interviews described as the most personal they have ever given about their mother, her sons have described the personal anguish they experienced and the "raw" grief they still feel.
Her unusual combination of fragility and steel, her need for loving attention and an ability to make those she met feel loved.
On the day of her funeral on 6 September, a nation mourned the death of the People's Princess. "They wanted to say thank you to those who made the journey to Kensington Palace". The royals learnt about the design and planning of the garden and were shown some of Diana's favourite plants.