It is easy to get up and start to lecture. President Obama was known for lecturing during his press conferences. But facts and opinions are not necessarily communicating.
It is easy to fall into thinking you have to tell everything during a presentation. All the details and history may bury uncomfortable facts, but is not communicating.
Communicating is thinking about your audience.
Who is going to be there?
What decision needs to be made? (Reason for meeting)
What information do they need to have to make their decision?
You communicate when you make it easy for the audience to learn, ask questions, discuss and decide.