Royal British Legion Festival honours the service and sacrifices of British armed forces from all conflicts, in particular those lost in the past year on active duty.
It will be followed by remembrance services on Sunday at the Cenotaph, while the nation will pause to reflect during the two-minute silence at 11am on Monday, Armistice Day.
This year's festival also commemorates the 70th anniversaries of the Battle of the Atlantic and the Dambuster raids.
The Queen and the Duke of Edinburgh will attend the Royal British Legion Festival of Remembrance tonight as the nation begins three days of honouring those who have lost their lives in conflicts past and present.
Other members of the Royal Family will also be present for the event at the Royal Albert Hall, which will feature performances from pop stars James Blunt - a former army officer - and Katie Melua, plus the tenor Alfie Boe and new group the Poppy Girls.
The audience of 4,000, including Legion supporters and military families, will be joined by an estimated 5.2 million viewers on television.
The Queen led the nation in observing a two-minute silence to pay tribute to fallen military servicemen and women for Remembrance Sunday.Read the full story ›
Very moving to be out on Horse Guards Parade, meeting veterans. And grandchildren here to honour their grandparents' service.
Sunderland FC have confirmed winger James McClean chose not to wear a Remembrance Day poppy on his shirt in yesterday's Premier League game against Everton, ITV Football has reported.
The Northern Ireland-born Republic of Ireland international's decision sparked a flurry of Twitter activity, with some users condemning the 23-year-old and others coming out in support of his right to choose.
The Prince of Wales and the Duchess of Cornwall attended a Service of Remembrance at the cenotaph in Auckland in New Zealand during their Diamond Jubilee tour of the region.
Taoiseach Enda Kenny, has attended a Remembrance service in Enniskillen, Northern Ireland.
The symbolic visit came as the Co Fermanagh town marked the 25th anniversary of the IRA Poppy Day bomb attack, which claimed the lives of 12 people.
Mr Kenny laid a laurel wreath at the cenotaph, only yards from where the no-warning blast detonated 25 years ago.