The second group of situations is not so clearly about persuading or selling. Your audience is more passive, there is no overt element of bargaining, and you might just want to ‘get in and get out’ as quickly as possible because you are not their main focus.
However, whether we want them to or not, the audience will take action in every situation mentioned in the two groups. They will form their opinion on you as a competent (or otherwise) project leader, as the guy who makes various parties feel comfortable (or otherwise) at events and meetings, and as the interesting (or otherwise) colleague that they’d like to talk with (or avoid) at the break.
Finally every audience will take action, even if only in thought. Shaping that action is your role as the presenter, no matter the size of opportunity to present yourself.