Knowing your audience is a key essential. This helps the speaker in understanding the interests of the diverse audience. The speaker can thus prepare the presentation accordingly that engages the whole audience.

When it comes to diverse audiences, one thing to keep in mind is that everyone is not the same. They'll have different levels of understanding, different levels of perception and others. So first know your audience. When you know your audience it's easy to express your opinions and thoughts in a way they'll understand. Go at a slow pace rather than going in a hurry so that the audience can grasp what you are saying. Address the doubts of the audience individually and clearly rather than clearing the doubt as a whole

Ask these questions: - What is the topic that will interest those diverse audience? - what might be inappropriate or insulting in terms of words or pictures? - What drives them to act? - Be careful with sense of humor. - Balance emotions with facts. - Speak to each audience as if he / she the only one attending

Use open language - don't refer to a single group or individuals but rather speak about the many. Keep your materials focused on the message and not on the "who". Do NOT allude to any certain group in particular, trying to cover a problem everyone knows pertains only to them - this would only show that you've singled them out as something to take special care of and would highlight your worries of not being inclusive. Just speak normally. About everyone.