RenFaires aren't supposed to be accurate depictions of anything, although one does run across the occasional authenticity Nazi. It is entirely normal to see Henry VIII in all his glory, an emaciated belly dancer, a Chinese dragon and a pirate a la Johnny Dep all in one glance. I have heard entirely accurate Provençal madrigals, O'Carolan on the lap harp and Eskimo Nellsung in the style of the Irish Rovers - all in the course of an afternoon.   One can buy beer, crystal necklaces, fancy boots, beer, swords (finely crafted, made of pot metal, or wooden), entirely unauthentic "period" clothing, Green Man plaques, incense...and did I mention beer? Go for the fun of it.