Saturday October 6 is this year's Green Buildings Open House day.
You can take self-guided tours of green buildings in your area, talk to the owners, find out more about the renewable & alternative energy technologies they have installed, as well as other green technologies.
Things generally run from 10am to 4pm.
More information can be found here: http://nesea.org/buildings/openhous
Note: This is where you can find listings for the Green Buildings Open House in the six New England States, plus Delaware, New Jersey, New York and Pennsylvania. I don't know where one might find the info for the other states, or even if it's scheduled for the same day elsewhere. One might check the website for the National Solar Tour.