Since "Halloween" means "All Hallows Eve"...
...is the "Eve of Halloween" the night before Halloween?
This too cute for words story from Atlas' Astonishing #47 (1956) doesn't answer the "eve of Halloween"question.
But artist Ed Winiarski and an unknown writer do present a Bewitched-style tale of a modern-day witch and her daughter which, oddly, doesn't show anything of the husband/father!
Was he a warlock or a mortal?
We'll never know the answer...