Ray there is the 800th anniversary King John charter christmas fayre , St Nicholas Church Great Yarmouth 28-30 November 2008. Don't know if there will be any re-enactment/leather stalls though.
Tom If you're coming over July 11-12 would probably be the best time, Tewkesbury's annual battle re-enactment with hundreds of traders (and a beer tent with some great brews) and 5000 idiots hitting each other with large lumps of metal.