The Reformation is habitually celebrated on Halloween, as that is the day (Oct 31) on which Martin Luther nailed his 95 theses onto the door of Wittenburg’s church, announcing a debate on the value of relics & pardons, which was the spark that set aflame the Reformation.
So when I say "Halloween Special," I actually mean "Reformation Day Special."
If you’re not familiar with the Reformation Study Bible, it was formerly called the ‘New Geneva Study Bible’ and the notes in it were edited by R.C. Sproul. Sample chapters are available for viewing.