May I suggest that the original posters of Events delete them, rather than leave it to Paul Hannaby, who, I am sure, has enough to do already.
It is simple enough to do, just scroll to the bottom of your posting and click on 'Remove topic'. This is just good, polite website etiquette.
I use the Events page to put two messages on the site. One covers the next two meetings at our club and is updated monthly, so would not be affected by an automatic deletion . However the other posting has our annual schedule. If that was to be deleted automatically after a month, it would rather defeat its purpose.