Activity For The Sake Of Activity
Interviewing a member who doesn't have anything interesting to say is a waste of time for you, the member, and the reader.
If you're going to do an interview, it should be with someone who will share and summarise expertise, introduce new viewpoints/perspectives, or disclose a remarkable piece of information.
Hosting a live discussion without something interesting to discuss is just as futile. If you can't get the right people to attend or you don't have an urgent topic that needs to be discussed, don't host a live discussion.
It's very easy to create an entire calendar of actions you will take. It's much harder to make each of them earn their place on that calendar.
Given the choice between posting a dull interview or letting a day pass without fresh content always pick the latter.