Every year, the annual Festival of Remembrance takes place to mark the sacrifices of those lost in previous wars.
The event is hosted by the Royal British Legion, and takes place at the Royal Albert Hall, which will welcome a host of singers and prominent figures, who will pay tribute to those who have lost their lives.
And typically, members of the royal family are usually all in attendance at this important annual event. However, two prominent members of the monarchy will be missing from this year's festival.
Prince William and Prince Harry this year won't be attending the festival, and will instead by heading off to rugby matches on Saturday 11th November.
It's a rare move for the young Princes not to attend the festival, but it seems as though their reason is actually pretty understandable.
Harry and William will be heading to the two different matches that weekend, in their capacity as patrons of two different rugby organisations.
The Duke of Cambridge and Prince Harry will both attend— Kensington Palace (@KensingtonRoyal) November 7, 2017
rugby matches on Saturday 11 November. pic.twitter.com/ECJgXhwUkf
The Duke of Cambridge, as the Patron of the Welsh Rugby Union, will be attending the Wales vs. Australia match in Cardiff, at the Principality stadium. And over in London, Harry will be going to the England vs. Argentina match at Twickenham Stadium, in his capacity as Patron of England Rugby.
Plus, the Princes are well known to be keen rugby fans! Prince William has regularly been spotted enjoying various matches over the years - attending many with Catherine by his side.
And like many a rugby fan, he's often been pretty vocal about his feelings when at games...
Prince Harry has also put in regular appearances at rugby events, both her and abroad, such as in New Zealand.
However, there will still be some key royals in attendance at the important event. The Duchess of Cambridge will be among the royals attending the Festival of Remembrance, alongside the newly-retired Duke of Edinburgh, who hasn't attended a royal engagement since the 4th September.
The royals will join the Queen at the Royal Albert Hall, in the specially designated royal box, in order to oversee the festivities. The Prince of Wales and the Duchess of Cornwall will also be at the event.
However, Harry will be paying tribute to the fallen in a Remembrance event taking place on 9th November. According to Kensington Palace, the Prince will officially open the Field of Remembrance at Westminster Abbey, a memorial garden that is created there every year by the Poppy Legion.
And, the two royals will also be in attendance at the Remembrance Sunday service at the Cenotaph at the end of the week.