Yes it is Halloween too and the girls will be dressed up and having fun in the neighbourhood. But it is also Reformation Day, the day Martin Luther posted his 95 thesis in 1517 and started the Reformation movement that would proclaim the authority of scripture and restore the Gospel to His church. An army of Reformers came from this movement - John Calvin being a prominent one.
Here is a brief video from a great preacher, John Piper.
In spite of his flaws, the essential meaning of Calvin's life and preaching is that he recovered and embodied a passion for the majesty of God and his word. The labor of exposition through preaching was the supreme work of his life.... in celebration of the God who restored the gospel to his church, we are making this video available today. My prayer is that it would stir in your heart a fresh passion for the majesty of the word of God. John Piper