Julian Cope presents Head Heritage

As I said, I wouldn't get too hung up about it if I were you. Even if you think of something like the World Cup final there is an element of ceremony about it. I really think ceremony and ritual are words used to convey that we don't really know what was going on at these places, but whatever it was there seems to have been a formality attached to it.
When you encounter an enigmatic site like Fernworthy, for example, a graduated stone circle with rows leading off toward cairns, I think ceremony/ritual use is a perfectly acceptable description, precisely because it is so vague.