This shot from 1976 features a 3 year old Brian (bottom right) and a spectacular view of the castle forecourt before the entire area was filled in with a stage.
I believe all of the white framed pictures are from the same trip but the photos were undated. Pictures of the Contemporary at the bottom of the page feature cars that could pinpoint the date but that's not an area where I have any expertise.
This shot of Fantasy Faire is from 1974 or 1975 and features a performance by Scat Cat and his band from the Aristocats.
Also not sure of the date on this photo but we have a stage in the forecourt now.