Any groups want to chat with Paul Wheaton? Permies.com and Wheaton Labs (the low-tech laboratory) Founder? His familiar speaking style fits well in impromptu gatherings as well as large events.
Paul can speak to many different topics regarding permies.com, wheaton labs, wofati eco buildings, homesteading on a budget, rocket mass heaters, replacing irrigation with permaculture, hugelkultur and his demonstrated truly passive greenhouse.
A two-minute sample of Paul's presentation style:
Paul gave this recorded keynote presentation
If you want to know more, just reply to this thread and we'll figure something out.