Let the prospective attendee know what they will have gained after the class. What skills or knowledge will they have gained? Are there things they could or should be able to do now that they couldn’t before? 

An example of this for the class “Intro to Jazz for Dummies” would be:

After this class, the student should be able to speak intelligently about the roots of Jazz music, define stylistic time periods in the history of Jazz, understand the evolution of the music, and identify important artists that contributed to the cultural phenomenon. After completing this class, you should have a basic foundation to pursue more in-depth studies on Jazz history, stylistic time periods, important artists, and the basics of Jazz theory.