When you must talk with an audience in a one way communication, please clean up your mess.
Know your purpose. Clearly define your key points. Be specific and meaningful. Stick to your purpose. Tell your audience what your key points are and why they are “key” to your overall purpose. You may have a lot to say and talking your subject may excite you, but don’t ramble on with endless information that may not be key to your overall purpose. Offer to stay back for awhile after your presentation to take questions and give your expertise then: where it can be targeted and meaningful to the person or group that wanted to know more.