At the Cedar Point Convention of 1922 a “Service Day” was set aside where hundreds of motorcars, each with five passengers, were volunteered days before to be led out into the countryside for witnessing from house to house.
... These were the beginnings of a global “locustlike” campaign under the leadership of “a king” (Christ Jesus), featuring field preaching that eventually covered all parts of the earth.—Rev. 9:1-11.