The Bible does talk a lot about public evangelism. In Acts, for example, the apostles preach to large crowds of unbelievers on many occasions. Their preaching is often direct and, even, confrontational. (e.g., Acts 2:14-40, Acts 14, Acts 7:1-51).
However, there is also a component of relationship and community that is evidenced throughout the Scriptures. (1 Thes. 2:7-12, Acts 19:9, 1 Thes. 4:12).
In my own life, daily discipleship is much harder than one-time events. I don’t particularly mind large, attraction-based, event-oriented evangelism (though I question their effectiveness in today’s culture). However, one-time evangelism must be accompanied by daily, sacrificial, authentic, missional living. I find it much harder to mentor a student weekly than take teenagers to camp once a year. It is much more time-consuming to volunteer in the local middle school than throw a Superbowl party. I have to be vulnerable when I share my life with other people and that scares me. When you share life you share success and failure, strengths and weaknesses.
By God’s grace I will strive to demonstrate the gospel not just once in a while but every day.