All of the festivals, TRF, Scarborough & Sherwood, have on the backs of their tickets a photo disclaimer that reads:
Commercial Photography and filming are conducted at the event site. You may appear in photos and/or films that may be used in connection with advertising, news reporting entertainment and other activities. Entry into the park and/or purchase of a ticket constitutes your consent for Sherwood Forest Faire, Texas Renaissance Festival or Scarborough Renaissance Festival to use all photos and films, without payment and in any manner or for any purpose desired.
From here on is my take on the disclaimer, if you don't want your photo taken, Faire is the wrong place to be.
George W (Moon)Dawg) Mulder