You cannot research just one aspect of your topic, but must take a holistic approach to the knowledge you seek. Research requires not only knowing your subject, and well , but also knowing your audience. Knowledge and facts are adaptable. Knowing who you are speaking to and what it is that will hold their attention is a natural step in preparing. If you are sufficiently knowledgeable and sufficiently intelligent, you can easily use your wealth of information to your advantage.
Some audiences are easier to prepare for simply by the nature of the speech.
For example, a eulogy is not a festive event. Other times, you will need to research your audience. This may require something as simple as observation or following social cues, or it might involve actual demographic information. Practice, practice, practice. Let s just use our examples.