Preparing to be Unprepared?

At the moment I'm procrastinating over two workshops that I need to prepare. I hate preping workshops and will spend days trying to prep and simultaneously avoiding it. On the other hand, philosophically and practically, I like workshops as a mode of teaching and learning. So why the disconnect?

Part of the problem, I suspect, is that for me workshops are about being in the moment: responding to the needs of students and their ideas and problems, and to do so requires a deep engagement with what is happening there and then. Coming up with a highly planned structure is the antithesis of being in the moment. Yet (of course) having a plan, and having the materials, and having the conceptual tools is what makes that 'in the moment' mode possible. It is easier when you have a sense of the group you will be working with, which in these cases I don't. Still, I'll try to come up with some activities and then see where that takes me.