One very important corporate survival strategy is to learn who your actual bosses are. If the CEO has an hour long all-hands about "corporate strategy" then that's not something you need to worry about. The only reason that meeting was an all hands is because the CEO has an ego to feed.

If your department head has a meeting about your department's priorities then you need to pay attention because they are the ones who are actually going to be observing and evaluating your work and how much they solved the problems that the department is being graded on. Pay attention to the people who pay attention to you.