In front of an audience of millions, on the streets of London and televisions around the world, The Queen made her way to St Paul's Cathedral for the Diamond Jubilee Thanksgiving service.
A very public occasion - with 700 guests including The Prince of Wales, the Duchess of Cornwall, the Duke and Duchess of Cambridge and Prince Harry.
Followed by a much more private one - a private lunch at Westminster Hall hosted by the Livery with invited guests representing a host of trades and professions.
One of those is Brad Steele - a stonemason from Staffordshire.
He's worked on, amongst many others, restorations on Chatsworth House in Derbyshire.
His next task is to turn these four one-tonne blocks of sandstone into huge gargoyles that will be paced at the tower of St Giles Church in Sheldon in Birmingham.
Another of the queen's special guests is Angela Weiss - a dressage trainer from Nottingham.
Formally an event rider she now trains horses from novice up to Grand Prix level.
The dinner itself is behind closed doors - but guests have a choice of foods including braised shoulder of mutton with Jubilee sauce, Lyme Bay crab, and grilled Isle of Wight asparagus.
Entertainment for the event is provided by the National Children's orchestra of great britain, where Harry Smith from Nottingham will play the Tuba.
Having played for seven years, he will join children from all over the UK in performing in front of The Queen.