“Friendship Evangelism” is where it’s at and is the most effective. It always has been. Another related one is Evangelism by Association ... in other words, because of some prior connection.
That should be a given, but it is far from effective at preaching the gospel to every creature, as very very few in most parts of the world have a Christian friend who will explain that to them.
But just two persons at a major event can hold forth word of life to multitudes passing by, offering them something recognizable about eternity and their soul, and the opportunity to converse about it.