John Berridge's first sermon out of doors was on May 14th 1759, as appears in a letter: "On Monday se'nnight Mr Hicks accompanied me to Meldred. On the way we called at a farm-house. After dinner I went into the yard and seeing nearly a hundred and fifty people, I called for a table, and preached, for the first time, in the open air. We then went to Meldred, where I preached in a field, to about four thousand people. In the morning, at five, Mr Hicks preached, in the same field, to about a thousand. Here the presence of the Lord was wonderfully among us, and, I trust, beside many that were slightly wounded, nearly thirty received heart-felt conviction."
For more on John Berridge, go to 'St Mary's Church Everton' on this website.
The works of ... John Berridge, with an enlarged memoir of his life [ed.] by R. Whittingham
http://www.archive.org/details/worksjohnberrid00berrgoog