IMO they do this wrong. It should extend past Halloween and two weeks in November. Doing these houses in late August/early September is just disgusting because that's the time of year that you still get the summer heat but without the afternoon storms to cool things off.
The thing is Labor Day gets crowded day guests and visitors who are there and willing to go to HHN.
No coincidence that August 30th is start of Labor Day Weekend this year.