Diogenesister: he mentions 5th Nov 2017...why? Was it random?
The idea seems to have originated around eight years ago.
I believe the date - November 5 - is tied in with the video below.
In addition, the original idea (?) appears to have also included trying to get as many ex/former-JWs to attend the Sunday public meeting at KHs around the world on this one day, as a passive display of the 'vast' number of ex-JWs.
I think that 2017 is the first year that November 5 has fallen on a Sunday since 2006.