The media dominate the media. But that doesn't mean what the media produce - hyper too-the-minute news - should dominate your public speaking. Actually, when your speech or presentation is weighted down with a rehash of current events, it will come across as just that: a rehash.
What it will lack or at least what the audience will perceive that it lacks is a deep understanding of an issue. All that news gets in the way.
Sure, if there is fire at the Jersey Shore and your business is property insurance, you will allude to this current event. But that's it. One example of a recent high-profile fire is enough. Then you proceed to showcase not the news or the media's coverage of the news. Instead you put out there your own expertise and how they can create value for members of the audience.