Encourage!

If you can keep your audience encouraged, then they will be more likely to listen. If you allow them to participate, they will respond and learn faster than you think. By giving your audience the chance to share their own ideas towards your subject makes, not just you more memorable, but also the point you're trying to make.
     This also is one of the best ways to get their input on your work, and you'll be able to know whagt was effective.