Reformation Day is October 25. Here is an order of worship from Reformed Worship that contains a lot of Reformation-era texts:
This order of service was prepared for Reformation Sunday 2003 at First Presbyterian Church, Royal Oak, Michigan. It includes several liturgical elements from the Protestant Reformation of the sixteenth century, including contributions from Luther in Germany, Bucer in Strassbourg, Calvin in Geneva, Zwingli in Zurich, Knox in Scotland, and from the English Reformation. The songs include a psalm, canticle, and hymns from these traditions; they can be found in the Presbyterian Hymnal as well as in many other hymnals.