1. I DO NOT draft behind anyone I don't know very well. So, if I went on an organized tour (or ride of any sort), and didn't know anyone there, I would not draft.
2. I tend to avoid drafting even if I do know the person very well. I tense up when I draft and end up with a stiff neck, sore shoulders, and a headache. However, that said, I seem to be able to draft behind Rowan, and I'm usually fine. But he rides at a very steady pace, and in a very straight line, and points out anything that might cause us difficulty in the road.
3. Unless there is a heavy wind and you're trying to make the campsite before dark, what's the point of drafting on a tour?