No one's explicitly said "no we shouldn't do it again" but obviously that doesn't count for much - in the face of conformity and having just put time and effort into it, we'd be looking for reasons to not admit that we didn't just waste time.

In case you haven't thought about it, you might want to send an anonymous poll/feedback form to everyone who attended. It's not going to take care of some of the effects (consistency bias, not wanting to make you sad, etc,), but might increase your chances of getting good feedback by reducing conformity pressures.