Open Air Preaching
Open air preaching is the act of preaching to people in public places, primarily on the street corner where there is a crowd of people. It's also done on college campuses by students, and in parks and other public areas where there is a crowd. It is the most traditional way of preaching a religious or social message, and has been used by many cultures and religious traditions.
The famous Christian evangelist Charles Spurgeon often advocated and performed open air preaching.