So, this is All Saints Day, Old style also known as St Martin’s Day.
Father Francis Weiser in the Handbook of Christian Feasts and Customs (quoted at https://onepeterfive.com/forgotten-customs-of-martinmas-and-st-martins-lent/) suggests this was the thanksgiving of Medieval Europe.
It was a holiday in Germany, France, Holland, England and in central Europe. People first went to Mass and observed the rest of the day with games, dances, parades, and a festive dinner, the main feature of the meal being the traditional roast goose (Martin’s goose). With the goose dinner they drank “Saint Martin’s wine,” which was the first lot of wine made from the grapes of the recent harvest. Martinmas was the festival commemorating filled barns and stocked larders.
It was also the time of year when lime plaster was renewed, because lime needs to be kept moist when renewed. It takes three to four days to form the calcite crystals that make it waterproof.
Martin of Tours was a soldier in the Roman Army who would not fight because of his Christian belief. When he met a beggar he cut in half his cloak and gave half to the beggar. He rose in the hierarchy of the Gallic Church and became Bishop of Tours. He is one of the very few early saints not to be martyred. He is the saint of soldiers, beggars and the oppressed. He stands for upholding your beliefs and helping those in need.
According to legend his barge on the River Loire was accompanied by flowers and birds and a late warm patch is called a St Martin Summer. It can also be called a Halloween Summer. Normally, though this is when it begins to feel really wintry.
St Martin was very famous in London and there are two famous Churches dedicated to him with possible early origins. St Martin’s in the Fields, near Trafalgar Sq has been the site of excavations and finds which show a very early settlement there, with early sarcophagi. It is the one place where a convincing case can be made for continuity between the Roman and the Anglo-Saxon period. It is likely, or at least possible, that the Church was founded soon after St Martin’s death. A settlement grew up near it, and this expanded to become Lundenwic, the successor settlement to Londinium.
St Martins Within, is just inside the Roman Gate at Ludgate, many early churches are found at or indeed above Gates, But this one has legendary links to burial places for King Lud, and for King Cadwallo, (Cadwallon ap Cadfan,) one of the last British Kings to have any chance of recovering Britain from the Anglo Saxons. He was said to have been buried here in a statue of a Bronze Horseman, and to protect London.
St Martin was also the saint of Travellers and this might explain the location of the Church near the gate. Although there is nothing but legendary ‘evidence’. It would make sense for an early church to be built near Ludgate, as St Pauls was founded in 604AD. Although the City might have been mostly empty, the presence of St Pauls means that Ludgate was most likely still in use or at least restored around this period.