I remember reading about a congregation where there was a delay in the arrival of their memorial invitations. Ended up they only got them the day before the memorial - so the elders decided that, because there was no time to hand them out leisurely to random calls, return visits and interested ones as usual, they would do something different. They decided just to do a leaflet drop in the area of the Kingdom Hall with the thousands of leaflets - with the address and time on them - without knocking the door or talking to the householder. It turned out it was a great success and they had many more times the number of people turn up than usual.
You would think they might make a rather obvious deduction - simple leaflet drops may be more effective than normal ministry in at least getting some new people into the Kingdom Hall to start with. Why the Society reported the experience, but did not follow up by instructing that others adopt the strategy is rather odd. They are too stuck in their ways I suppose.
So I was thinking of doing my own experiment. What if I delivered a few thousand invitations to the memorial in the neighbourhood just to see how many extra turn up? Would be interesting, if there was a real influx of newcomers, how the congregation would react...