Oct 31 is Reformation Day! 
According to wikipedia:
http://en.wikipedia.org/wiki/Reformation_Day
Reformation Day is a minor festival celebrated in remembrance of
the Reformation, particularly by Lutheran and Reformed church
communities. It takes place on October 31 and is an official
holiday in many countries. It coincides with Halloween, the eve
before All Saints' Day. Many families in the Reformed tradition do
not allow their children to observe Halloween on the grounds of
various satanic associations.
On this day in 1517, Martin Luther posted a proposal to debate the
doctrine and practice of indulgences. This proposal is popularly
known as the 95 Theses, which he nailed to the Castle Church door.
This was not an act of defiance or provocation as is sometimes
thought. Since the Castle Church faced Wittenberg's main
thoroughfare, the church door functioned as a public bulletin board
and was therefore the logical place for posting important notices.
Nonetheless, the event created a controversy between Luther and
those allied with the Pope over a variety of doctrines and
practices. When Luther and his supporters were excommunicated in
1520, the Lutheran, Reformed and Anabaptist traditions were
born.
Within the Lutheran church, Reformation Day is considered a minor
festival, and is officially referred to as The Festival of the
Reformation. Until the 20th Century, most Lutheran churches
celebrated Reformation Day on October 31st, regardless of which day
of the week it occurred. Today, most Lutheran churches transfer the
festival, so that it falls on the Sunday (called Reformation
Sunday) on or before October 31st and transfer All Saints' Day to
the Sunday on or after November 1st.
The liturgical color of the day is red, which represents the Holy
Spirit and the Martyrs of the Christian Church. Luther's hymn, A
Mighty Fortress is our God is traditionally sung on this day.
Lutherans customarily stand during the hymn, in memory of its use
in the religious wars of the Sixteenth Century.
It is also traditional in some Lutheran schools for schoolchildren
to hold Reformation Day plays or pageants that re-enact scenes from
the life of Martin Luther.
Reformation Day is also a public holiday in Slovenia, as the
Reformation contributed to its cultural development profoundly.
Nevertheless, Slovenians are mainly Catholics.
I think today is Reformation Sunday .. 
