You need not be a nut.

Here is some excellent, common sense information on open air preaching written by well-known preachers of the past who did it with success. http://www.biblebelievers.com/StreetPreaching1.html

May God raise up a new generation of wise, Spirit-led street preachers.  Here’s a great idea I read on this site.  If your church has a  field or park like yard, why not use it instead of a hot auditorium  on hot summer evenings?