This is great, Laraine, and a bit dizzying! ;-) As well as the different types of eavesdropping, there are different methods, aren't there?

There is the passive hearing - those bits where one really has no choice or active role in listening: what you list as the public occasions listening.

There is spying - where someone has been sent deliberately to listen and report back: Polonius setting Reynaldo to spy on his son; Claudius setting R&G to spy on Hamlet; Hamlet setting Horatio to spy on Claudius during the play, etc.

And then there is eavedropping, and thus not having to filter the event through another's impressions: Polonius behind the arras listening to Hamlet and Gertrude; Polonius and Claudius eavesdropping on Hamlet and Ophelia; Hamlet watching Claudius at the play and later at prayer; Hamlet and Horatio eavesdropping on the Gravediggers and then the funeral mourners; etc