The whole KH maintenance system has changed after the replacement of the RBC with LDC. In the past congregations were responsible for minor works (e.g. replacing broken tiles in the toilets, fixing the roof etc). Now these have been put into the responsibility of the LDC. The only thing the local congregation is responsible for is the cleaning and basic preventative maintenance.
These meetings are to explain to the local congregation what they can do to help keep the hall in tip-top condition and reduce the need to call in the LDC. It's the sort of thing they could easily talk about in 30 minutes instead of a normal public talk but they have to make some meal of going over and over and over contrived interpretations of biblical texts so they can relate them to petty nonsense about cleaning.