Religious revivals have a long history of preaching out of doors.
The great London preacher Charles Haddon Spurgeon wrote: "It would be very easy to prove that revivals of religion have usually been accompanied, if not caused, by a considerable amount of preaching out of doors, or in unusual places.
For two thousand years, out of doors preaching by gifted evangelists resulted in the founding of religious orders, movements, denomination, charity organizations, colleges and universities.