Someone rang the BBC to say ...
"I would like the programme to discuss the idea of having a Jubilee. This would greatly help out the country and it only happens every fifty years. Debts are written off by Kings. This would be a very good idea."
This is how Editors learn of calls to the BBC about their programme (PM) followed by the nature of the the call (General.) I think the other categories include complaint, and the opposite of complaint, but clearly nothing for jubilees, jamborees, or knees-up generally.