Lord Mayor of London been mandatory for election to the Lord Mayoralty. Two Sheriffs are selected annually by Common Hall, which meets on Midsummer's Day for this purpose. By an ordinance of 1435, the Lord Mayor must be chosen from amongst the Aldermen of the City of London. Those on the electoral roll of each of the City's 25 Wards select one Alderman, who formerly held office for life or until resignation. Now each Alderman must submit for re-election at least once in every six years. The Lord Mayor is then sworn in November, on the day before the Lord Mayor's Show ("see below").
Lord Mayor's Show reflects that this was once one of the most prominent offices in England. The position of Lord Mayor has a role within the City and is entirely distinct from the position of Mayor of London (a role which has existed only since 2000), namely the elected head of the Greater London Authority, currently Sadiq Khan. The Lord Mayor's Show is centred on a street parade which in its modern form is a light-hearted combination of traditional British pageantry and elements of carnival. On the day after being sworn in, the Lord Mayor and several others participate in a procession from