Gospel Halls around the world are involved in spreading the gospel of Christ through various means including public preaching, literature work, Bible exhibitions, Sunday schools, radio programmes, prison and school visitation, hospital work and gospel tent meetings during the summer months. Distribution of gospel tracts, gospel calendars and other evangelistic material is commonplace as well as open-air preaching. With thousands of assemblies and with many hundreds of full-time itinerant evangelists, missionaries and Bible teachers, the enterprise of spreading the message of Jesus Christ and upholding the fundamental truths of the Bible continues as the vision of Christians gathering in Gospel Halls worldwide. During the last half of the 20th century and into the 21st century, while shrinkage was a feature in Europe, expansion was seen in numerous places, notably Canada, South and Central America and Mexico.