The concept of the open society is worth spending some time on.
What does an open society mean? Students may want to talk about what part of society should be open and what should not. How freely should information be available?
There are many situations where an open society might or might not be a good thing. For instance, most of us expect our income taxes to be to kept confidential (and the U.S. Treasury has a very good record in that regard). But what about somebody who runs for public office? Should their tax returns remain confidential?