Give teachers time to talk to and learn from each other Teachers need to construct their own knowledge, just like everyone else. I try to give them time to interact, discuss what they're thinking about, ask questions, and basically do all the things you want their students to be able to do in class. I want them to stay focussed on the workshop topics, however, and I'm learning ways to do this. It doesn't take their full concentration, so they have time to interact, yet the activity tends to draw them back. Give them breaks.
Food is good, too.
If you can possibly manage it, prepare a participants' address list so they can make notes on it and maintain the contacts they make at your workshop. Use the teaching methods you want them to use . I want to tell them, so many resources I want to share with them, and such a short time in which to do it, that it's always very tempting to deliver it in an efficient lecture. Fortunately, I've experienced enough workshops to know how ineffective this truly is. My stacks'o'stuff get used only a little if I don't have time to learn and appreciate what's in them.