Just found exactly the sort of thing I'm looking for but it's on the 3rd. :(

03 Jan 2010 Twelfth Night, London
Sunday 12:45 South Bank. Annual ancient seasonal customs with contemporary festivity. Free. To herald the celebration, the extraordinary Holly Man, the Winter guise of the Green Man from pagan myths and folklore, decked in fantastic green garb and evergreen foliage, appears from the River Thames brought by a Thames Cutter, where he is met by Mummers. The Mummers then process to the Bankside Jetty (east of Blackfriars Bridge), and perform the traditional 'freestyle' Folk Combat Play of St. George, featuring the Turkey Sniper, Clever Legs, the Old 'Oss and many others, dressed in their spectacular 'guizes'. The play is full of wild verse and boisterous action. Cakes are handed out at the end of the play, 2 of which have a bean or pea hidden in them. Who ever finds them will be crowned King and Queen for the day and then lead the people through the streets to the historic George Inn in Borough High Street for storytelling, the Kissing Wishing Tree and dancing. Free. Twelfth Night, London