I recommend this post from http://www.copyblogger.com/ on how to capture an audience's attention because it is not merely a matter of gimmicks. It includes some key points of engaging content that include making it personal and not stripping out emotion. Don't skip the comments, which contribute further insight. I've copied some of them below. These follow a comment on an anecdote in which no one came to watch the show until the manager wrote "Free beer" on the door.