Isn't it ironic - the one day of the year you can pretty much guarantee that most people are not only home but anticipating people people calling at their door ... and Jehovah's Witnesses don't go out that day.
Heck, if the householder isn't receptive they even have the get-out option of claiming it was a joke and they dressed up as Jehovah's Witnesses for Halloween! :D
Of course we know the aim of the ministry for most is to avoid talking to people. That's why they do it during the day midweek or on Sat morning or Sun afternoon when people are most likely out.