The target client is corporate -- marketing teams, executive teams, HR teams. The lecturer has plenty of accolades but his past success has been seminars for creative writers. The business storytelling seminar is new.
I would start with creating a landing page that are talking directly to the target group. Get the lecturer to record a video talking to them and teasing the what they would learn.
Then I would use Facebook and LinkedIN ads targeting my dream customers. And of course a/b test all the way.