I did it hmph years ago, if you've been invited why are you wasting your time posting here, reply as fast as you can!
It will really open your eyes to what, how and why you can eat. The course I attended was brilliant and it's been fantastic leaving with that extra knowledge and insight.
Prior to doing DAFNE I'd done a half day carb counting course which began opened my eyes to what I was eating in order to match what I was injecting.
All of a sudden I discovered injecting to what I ate - sounds so simple and logical, DAFNE explains all and gives you the confidence to go out and do it was part of your everyday life.