you may photograph things that are not meant to be noticed and that don't belong on websites where the nasties can see them.
What a load of hogwash!
If the "nasties" want to see them then they will see them. They probably have already seen them or they can go themselves to the many other points around the field that B A Lert was suggesting or indeed to the many other places around the world where this travelling clusterfeck goes, and take their own photos, make their own drawings or do whatever. Rest assured that the "things that aren't meant to be noticed" have already been noticed and are on countless websites already.