Dennis: you appear to be quoting the old Rule 5. The new Rule 5 has a specific section about landing and taking off near open air assemblies :
here
And there's a seperate doc which outlines procedures :
here
Heard of a case recently where the CAA tried to prosecute someone for changing the landing site after the crew saw that the site nominated did not conform to requirements. Because that decision was taken in the air, no written permission was obtained although permission was obtained over the radio and the landing happened at a safer site still within the bounds of the landowner. However, CAA somehow found out and decided to launch an investigation - including questioning under caution and interviews with witnesses.
If it had gone to court, the CAA would have been prosecuting someone for being too safe!