I can volunteer for one of the three days, more than one if needed. I've booked the flight back from Edinburgh Friday afternoon and wont return until Monday so that's the whole thing covered.
I do want one day at the festival though, where my only responsibility is to give the microbreweries of Ireland as much business as my bank account will let me.
As for what to do, I think a presentation on the ingredients of beer and how it's made would be great. It doesn't have to be in a homebrew context, plenty of people go on brewery tours with no interest in homebrewing. But differentiating between the Guinness brewery and the microbrewery while not associating microbrewing with homebrewing is something I've had to explain over and over to people, I think it is something in which there would be a genuine interest.