What Is 'Reformation Day'?

Some Protestant churches mark the day as Reformation Sunday, and celebrate it on the Sunday just before, or just after, Oct. 31. More often than not, the hymns sung in church that day include “A Mighty Fortress Is Our God,” with words and music composed by Luther himself. But most members of Lutheran churches — the direct descendants of Luther’s movement — wait until Oct. 31. And that, as we know, is also Halloween, and has led to some creative celebrations for kids.