Reformation Day is celebrated on October 31st and is an important commemoration of religious reformers like Martin Luther, who sought to rectify hundreds of years of doctrinal errors and restore the church to its biblical roots. This holiday is significant for both Calvinist and Lutheran Churches, although other Protestant communities also tend to commemorate the day. It is lawfully and officially recognized in some states of Germany and sovereign countries of Slovenia and Chile. Celebrations may include attending a lecture, watching a movie or documentary, or special church services and hymn singing.