Prince Harry is expected to attend the annual WellChild Awards tonight.
The event, held at the London Hilton, recognises the courage of seriously ill children and their families.
15-year-old Cecilia Adamou, from Cobham, is nominated for an award.
The teenager has had heart surgery and is now being treated for tumours in her brain and spine.
Prince Harry's Invictus Games have opened at the Olympic Park tonight. He was joined by Prince Charles, Camilla and Prince William at the opening ceremony, along with 6,500 spectators. The Duchess of Cambridge has missed the ceremony due to morning sickness.
The Games take place over four days and will see wounded servicemen and women from 13 countries take part.
Prince Harry took to the stage to praised the wounded warriors from around the globe for their stories that "move, inspire and humble"
"No longer are these inspirational men and women defined by their injury but as athletes, competitors and team mates. "Over the next four days we will see some truly remarkable achievements. For some of those taking part, this will be a stepping stone to elite sport but for others it will mark the end of a chapter in their recovery, and the beginning of a new one."
The ceremony has had a distinct military theme with a fly past from The Red Arrows, a display by The King’s Troop Royal Horse Artillery and performances by bands from the Royal Marines, Army and RAF.
Athletes are making their final preparation ahead of the opening ceremony of the Invictus Games at the Queen Elizabeth Olympic Park. More than four hundred injured service personnel from thirteen nations will compete over next few days.
The Duke and Duchess of Cambridge were accompanied by Prince Harry to view the thousands of ceramic poppies which have been planted around the Tower of London.
The royal trio each planted a ceramic version of the flower in the Blood Swept Lands And Seas Of Red art installation to pay tribute to the British soldiers who fell during World War One.
The Tower's moat currently consists of 120,000 poppies but more will be added over the coming months until there are 888,246 on November 11.
Every poppy planted will mark each British and Colonial death during the war.
Prince William was heard telling the artwork's creator Paul Cummins, that the piece was "spectacular" before they joined him to climb the Middle Tower to view the artwork from up high.
Prince Harry wished Royal Marines good luck before they set off from the Cutty Sark to complete the final phase of their epic ‘1664 challenge’ with a moonlit 30 mile march which finished in London today. The event celebrates 250 years since their formation.
It's one of the most gruelling endurance races in the world - rowing 3,000 miles in 48 days across the Atlantic. And, today, Prince Harry was in Oxfordshire to praise the crew, including two injured ex-servicemen, for successfully completing the toughest challenge of their lives.
The Prince was in Henley-on-Thames at the home of rowing and the 'Row to Recovery' charity.
The race has been supported by the Endeavour Fund - set up by him - to encourage more wounded veterans to take up the sport. Mel Bloor was at the Royal event.
Interviewees:Cpl Scott Blaney, crew member and Catherine Yoxall from The River and Rowing Museum.
Prince Harry is in Henley to meet the Row to Recovery crew of wounded ex-servicemen who successfully rowed across the Atlantic last year. The adventure was backed by the Endeavour Fund, created by The Royal Foundation of The Duke and Duchess of Cambridge and Prince Harry.
A man who walked into a police station and stated that he wanted to kill Prince Harry has been jailed for three years. Ashraf Islam, who's 31 and of no fixed abode, was arrested after making the threat at Hounslow police station in May 2013.
Mr Islam pleaded guilty when he appeared at Uxbridge Magistrates' Court last May, but was only sentenced today.
No weapon was found in a search of Islam's hotel room in Hounslow, where he was staying after flying into the country from Thailand via Hong Kong.
Prince Harry, who has twice been deployed to Afghanistan, is to become a Staff Officer at HQ London District, which organises ceremonial spectacles like Trooping the Colour and state visits.
Earlier it was announced the Prince has completed his attachment with the Army Air Corps flying Apache helicopters.
He will begin his job in the next few weeks and there is speculation his new role based in Horse Guards in central London will allow him to get in involved with the Warrior Games.
Harry flew to America last year to support competitors taking part in the Games, a paralympic style event for injured servicemen and women, and he hopes to help bring the event to the UK.
Lieutenant Colonel Tom de la Rue, who commanded Harry in the Army Air Corps, said: "Captain Wales has reached the pinnacle of flying excellence as an Apache pilot, particularly in Afghanistan and, in the process, has proved to be a real inspiration to the many Army Air Corps officers and soldiers."