Investigate audience interests from "summary" of The Art of Public Speaking by Dale Carnegie

Assess what type of data associated with your audience is available to better understand their interests. Taking into consideration the age, demographic or any other profile related features that could influence the general interests of the audience.

Make use of social media platforms to study trends and conversations around the topic - This can help one recognize not just what the current interests of the audience are but also what they might be exposed to in the future.

Concentrate and follow broader sources like publications, blogs, magazines, news covering topics relevant to the audience’s interests.

Spend time analyzing and mining existing information about your target group from surveys, reports or industry studies on demographics and look for common threads in interests between different members in this particular group.

Network with individuals that form a part of the audience you would like to target - Ask them straight out what they are interested in experiencing or learning more about.

Examine the size and nature of the platform so as to get a sense of who may have interacted on it already. Look into past events and figure out which kind of topics drew more attention and went viral.

Monitor discussions online by engaging yourself in discussion forums, chat rooms and blog sites related to what your audience may find interesting.

Take steps to invest in conducting market research if possible - A survey or engaging in focus groups can assist in uncovering unknown insights about interests.

Stay aware of popular topics both inside and outside the industry. These could prompt questions for quantitative investigations or trigger dialogues on new trends and fads.

Evaluate buying behaviours and listservs which can act as a wealth of snippets about every person engaged in the process.