Reformation Day, the anniversary of when Martin Luther began the Protestant Reformation, is an observance remembered by hundreds of American churches in the modern day. While the exact date of Luther's call to theological debate was Oct. 31, or the Eve of All Saints' Day, many Protestant congregations choose to observe the occasion on the last Sunday in the month. This year, Reformation Sunday will fall on Oct. 27, with Protestant denominations such as Lutherans, Presbyterians, and Baptists drawing attention to the past. ...