Holy Saturday touches my imagination because its the time that — in some strains of Christian theology — the dead Christ visits and ransoms from hell the holy dead. To my Universalist mind, it must have seemed more like a cosmic jailbreak (though I’m not one to put divine actions in a linear timeline.)
Something about the force of this liberation put me in mind of the medieval Name of the Rood, which I now read each Holy Saturday. You’re welcome to follow along old blog posts about it.