Keeping an audience's attention requires the speaker to be entertaining. If a presentation isn't entertaining, it's not a presentation. It's a cure for insomnia. Mr. Calhoun entertains by using the following:
Audience Interaction (and not the overused ‘raise your hand if…’ ).
Not only should a presentation be entertaining, it should also provide audiences with a Take-Away. If there's no Take-Away, it's no different than going to a movie. All, and we mean ALL, of Mr. Calhoun's presentations are intentionally educational by design. If attendees should have any questions, Mr. Calhoun stays around for Q & A's.
In short, these aren't programs. They're experiences.