A complete set of competition rules and regulations is available on the Estrella Period Demo Center website (click "original article" below and scroll down to the bottom of the page).
According to the rules:
The purposes of this competition is to facilitate an interest in and appreciation of well-executed "period" cooking. The quality of cookery, variety, originality, flavor, and presentation/visual appeal of food will be of primary consideration. Because we are a historical re-creation organization with a strong interest in the pre-1600 AD time period, significant consideration in judging will be taken concerning recipes used, cooking methods/tools/techniques, and settings created for the presentation of the food. No documentation will be required or judged in this competition.