"Street preaching" is an ancient practice going back to the prophets of the Old Testament. In the New Testament, our Lord Jesus Christ proclaimed his glorious message in the "open-air," speaking plainly to the common man. The Book of Acts records the early Church obeying the command of the Saviour to go into all the world and preach the Gospel. Church History reveals that our forefathers brought the glad tidings of the Gospel to those outside their church buildings. We seek to carry on this biblical practice in these last days.
http://www.biblebelievers.com/StreetPreaching1.html
http://www.biblebelievers.com/StreetPreaching1.html