The Queen will dine at Westminster Hall today at a celebratory Diamond Jubilee lunch hosted by the Livery.
Some 700 guests representing the companies' abundant trades and professions, ranging from grocers and gunmakers to fruiterers and fishmongers, will join the Queen for the tribute.
The Prince of Wales, the Duchess of Cornwall, the Duke and Duchess of Cambridge and Prince Harry will also attend the meal.
The House of Commons' speaker John Bercow will say grace and the loyal toast will be proposed by the Lord Speaker Baroness D'Souza.
Music played by the National Children's Orchestra of Great Britain be will performed during the event.
The Queen at the Diamond Jubilee concert on Monday, where she continued to attend celebrations despite Prince Philip being taken to hospital with a bladder infection
Prince William will dine at the Engineers and Arbitrators table, while Kate will be joined by the Master Glovers and Pattenmakers.
The Worshipful Company of Pattenmakers was founded in the 17th century as a trade association for the makers of pattens - under-shoes of wood and metal which were worn strapped beneath the shoes to raise the wearer out of the mud on the streets.
The Company now draws its membership from the City of London and the Footwear industry, with its main focus being charitable works.
The Worshipful Company of Glovers was formed in 1349 by glove makers in London to protect their craft.
Harry will be on the Fruiterers and Gardeners table.
Among the vast range of participating Livery companies are the Worshipful Companies of Goldsmiths, Butchers, Innholders, Weavers, Distillers, Clockmakers and even Tax Advisers.
Guests will dine on marinated Uist Island salmon with Lyme Bay crab, followed by saddle of Welsh Cambrian Mountain lamb with braised shoulder of lamb, grilled Isle of Wight asparagus, Jersey Royal potatoes and an aptly named Jubilee sauce.
The "symphony of dessert" is chocolate delice, bread and butter pudding and berry compote with Sandringham apple sauce
A Ceylon tea will also be served made from a bush planted by the Duke of Edinburgh during a state visit to Sri Lanka in 1954 in the Pedro Tea Plantation in Nuwara Eliya.
The Livery Companies of the City of London originated in medieval times as Guilds responsible for trade regulation, including checking the quality of goods, weights and measures and training.
Today the companies use their funds to undertake charitable and community work.