From what I've heard (and I suppose this is Scandinavian lore) is that every Easter the witches make their annual trip to blåkulla (I think it's some kind of portal to hell? Total speculation though) and they fly there on brooms. Because of that it was tradition to lock in every broom or any kind of pole you had in your shed to not get them stolen. I also think you were supposed to spread out salt to keep the witches away so that they wouldn't come in and slit your throat. It was important to salt every crack since witches could go through even small keyholes. Why Easter? I dunno, Celebrating that Jesus died with satan or something?
@lucifer