I have been posting some thoughts and quotes concerning open air preaching primarily for myself. All of this is keeping the matter on my mind, and by sharing it with others I find additional accountability. Here's another quote from Spurgeon on the benefit of open air preaching.
"The great benefit of open-air preaching is that we get so many new comers to hear the gospel who otherwise would never hear it. The gospel command is, 'Go ye into all the world and preach the gospel to every creature,' but it is so little obeyed that one would imagine that it ran thus, 'Go into your own place of worship and preach the gospel to the few creatures who will come inside.'"
- C.H. Spurgeon, Open Air Preaching — Remarks Thereon.