There is a round-up of some clear gospel thinking on Halloween and Reformation Day:
Here's a combo on Halloween and Reformation Day at Desiring God.
And here's some good, missional and incarnational thoughts on how to think of and do Halloween again, over at Desiring God.
And for a complete Desiring God hat trick, here we are reminded of the blessed gospel of God's grace in Christ that the Holy Spirit opened up to Martin Luther through his study of the Word, sparking the Protestant Reformation.
Justin Taylor quotes John Calvin on why God raised up Martin Luther to reform the church.
And here Justine Taylor interviews church historian, Carl Trueman, on Luther's 95 theses.
And here is Steven Wedgeworth on why we celebrate Reformation Day.
This is the day that the Lord has made; let us rejoice and be glad in it!