Basically, I would say that the trick is to dress up everyone in the sort of kit which is used in Hollywood films about the Arthurian legends and then get your musicians to make the sort of racket which forms the soundtrack to those sort of films. Trying to replicate a historically accurate court of the fourth, fifth or even tenth century (claimed for Arthur by some) is always going to be a thankless task for uncertain reward. People like to believe it looked and sounded like the Hollywood version - so that's what I'd give them!