Thanks to the ancient and justified concerns of King John, every newly-elected Lord Mayor is required to leave the safety of the City of London, travel upriver to distant Westminster and swear loyalty to the Crown.
Over the centuries this inconvenient journey became one of London's favourite rituals. It moved from river barges to horseback and then into the magnificent State Coach, and around it grew the rowdy and joyful mediæval festival that became known as the Lord Mayor's Show.
That ancient pageant is still going today. The modern procession is over three and a half miles long and fills the whole space between Bank and Aldwych from 11am until about 2.30pm, cheered by a crowd of around half a million people and watched live on the BBC by millions more.
There are fewer sword fights these days but the floats are grander than ever and it's a great day out for every generation. You are all warmly invited to come to the City of London on November the 8th and take your place in eight centuries of London history.
We hope that this site has all the information you need to make the most of your day at the Show. If anything is missing, please send an email to Will on will at lordmayorshow.org or tweet @lordmayors_show. For the very latest news, please follow our twitter feed.