Officials Clinics, What Makes them Good?

[Bob Mc]

I have this on another board now and am looking for as many suggestions as possible.

Looking for some input from you people on what makes an officials clinic good? What topics do you feel it is important for position leaders to speak to? Who do you want as position leaders? Who do you want for on field evaluation? What is it that makes for an experience that both new and used (?) okay, experienced officials would find enjoyable and meaningful?