Your problem because you finished Sue's and Jane's quests before others.
I've posted walkthrough after I finished at last after third game restart. And while I've been writing that walkthrough I started for fourth time and finished all activities.
Link for walkthrough
I don't thnik so as i was consulting the in game "guide" quite often and pretty much finished Jane's line last. And this point Mrs.White - "Unlock the first Halloween event" has never even appeared in this playhtrough of mine and as far as i remeber from way older versioas, it was like triggered automatically at the approporiate time, like you went to sleep and with all conditions set it would happen ? though it was a long time/version ago.
Either way if it is as you say then it just shows bad design. You either cannot be allowed to progress one storyline beyond a point that is set to trigger other storyline OR once you ineviatebly move beyond that point appropriate flags and triggers should be set so that you can progress other storyline. And for the most part that how it works, you star A then reach a point where you need to go to story B, progress it to a point then move to story C and so on. So how come they couldn't apply this propelry for the whole game ?!..... Either way im gonna wait till 0.18 is out and then play from scratch