Only six people came.
He gave his talk on Zen meditation anyway.
One of the six became Jon Kabat-Zinn, Ph.D., who had his first encounter with meditation that night. Kabat-Zinn is a pioneer in the scientific study of mindfulness and is responsible for teaching meditation to many thousands of people.
What is the right audience? The Zen answer is, the audience you have.
See free, easy Meditation Instructions on this blog.