“Hi Everybody. How are you feeling today?”
Some speakers like to start their presentation by asking the audience a question or in some other way involving them in a two-way conversation. Have you ever noticed how awkward that technique can be? The audience isn’t ready to participate. They want to gauge you and get their bearings on the topic.
It’s OK to get involved with the audience, just not at the very beginning. That’s the time when you need to demonstrate you are the most confident speaker in the universe.