The Midwest Renewable Energy Association energy fair

 The Midwest Renewable Energy Association energy fair is coming up on
June 20-22 in Custer (near Stevens Point) WI.
The Energy Fair is the world's largest renewable energy, energy
efficiency, and sustainable living educational event of its kind

http://www.the-mrea.org/energy_fair.php

here are other energy fairs/ events around the country

http://www.builditsolar.com/References/Events/Fairs.htm