A number of authors rightly suggest that we should be open to God the Holy Spirit inspiring and guiding our evangelism through spiritual gifts such as prophecy, discernment and words of knowledge and wisdom. In particular this is a feature of the ministries of evangelists (Baptist) Chris Duffet in Big Hearted (Gilead Books 2012) and (New Frontiers) Pete Gilbert in Kiss and Tell (CWR 2003) who each give a number of examples. See also Prophetic Evangelism by Mark Stibbe (Authentic 2004).
For over 30 years I have defended my understanding that every Christian and every church should be open to God speaking directly to us in such ways. See “The Prophet-Hood of All Believers” online on my ministry, mission and theology Thoughts blog at http://pbthomas.com/thoughts/?page_id=32