Not quite: The Princess Royal was at a commemoration on the Isle of Wight; The Duke of York was in Northern Ireland; and the Gloucesters and The Duke of Kent were also at other events. They just didn't get the press the others did.
Court Circular 4 August 2014
BUCKINGHAM PALACE: ...Her Majesty this evening attended a Service of Commemoration in Crathie Parish Church to mark the Centenary of the First World War.
... [FONT=verdana, arial]
[FONT=verdana, arial]The Duke of Edinburgh[/FONT][/FONT] this evening attended a Commemoration Service in Sandringham Parish Church to mark the Centenary of the First World War.
CLARENCE HOUSE: The Prince Charles, Duke of Rothesay this morning attended a Commonwealth Commemoration Service in Glasgow Cathedral on the Centenary of the outbreak of the First World War and was received by Her Majesty's Lord-Lieutenant of the City of Glasgow (Councillor Sadie Docherty, the Rt. Hon. the Lord Provost).
His Royal Highness afterwards attended a Reception at Glasgow City Chambers, George Square, Glasgow.
The Prince Charles, Duke of Rothesay subsequently laid a wreath in George Square and took the salute at a march past.
The Duchess of Cornwall this evening attended a Commemoration Service in Westminster Abbey on the Centenary of the outbreak of the First World War.
KENSINGTON PALACE: The Duke and Duchess of Cambridge this morning attended a Ceremony at Cointe Interallied Memorial, Liege, Belgium, to commemorate the Centenary of the First World War in the presence of The King and Queen of Belgium.
Their Royal Highnesses were entertained to Luncheon by Their Majesties at the Prince-Bishops' Palace, Liege, this afternoon.
The Duke and Duchess of Cambridge and Prince Henry of Wales this evening visited Mons Town Hall.
Their Royal Highnesses afterwards attended a Reception with the families of soldiers buried at St. Symphorien Cemetery.
The Duke and Duchess of Cambridge and Prince Henry of Wales, representing The Queen, subsequently attended a British Ceremony at St. Symphorien Cemetery to commemorate the Centenary of the First World War.
Their Royal Highnesses later arrived at Royal Air Force Northolt from Belgium. Mr. Miguel Head, Miss Rebecca Deacon, Mr. Edward Lane Fox, Dr. Edward Perkins, Captain Florian Graham-Watson and Major James Lowther-Pinkerton were in attendance.
KENSINGTON PALACE: Prince Henry of Wales this morning unveiled a Memorial Arch in Folkestone during a Service of Commemoration to mark the Centenary of the First World War and was received by Her Majesty's Lord-Lieutenant of Kent (the Viscount De L'Isle).
His Royal Highness this afternoon departed Lydd Airport for Belgium. Mr. Edward Lane Fox is in attendance.
BUCKINGHAM PALACE: The Duke of York this evening attended a Commemoration Service in the Cathedral Church of Saint Anne, Belfast, to mark the Centenary of the First World War and was received by Sir Nigel Hamilton (Vice Lord-Lieutenant of the County Borough of Belfast).
BUCKINGHAM PALACE: The Earl and Countess of Wessex this evening attended a Service of Commemoration in Guildford Cathedral to mark the Centenary of the First World War and were received by Her Majesty's Lord-Lieutenant of Surrey (Dame Sarah Goad).
BUCKINGHAM PALACE: The Princess Royal, accompanied by Vice Admiral Sir Tim Laurence, today visited the Isle of Wight and was received by Her Majesty's Lord-Lieutenant Major General Martin White).
...The Princess Royal afterwards attended a Vigil Service at the Chapel of St. Nicholas in Castro, Carisbrooke Castle, Newport, to commemorate the Centenary of the First World War.
KENSINGTON PALACE: The Duke and Duchess of Gloucester, this evening attended a Service in Llandaff Cathedral to commemorate the Centenary of the First World War and were received by Her Majesty' s Lord-Lieutenant of South Glamorgan (Dr. Peter Beck).
ST. JAMES'S PALACE: The Duke of Kent, President, Commonwealth War Graves Commission, and President of the Board of Trustees, Imperial War Museum, this afternoon opened the "Fields of Battle, Lands of Peace" exhibition in St. James's Park, London SW1.