What is a house concert? Well, it literally is a concert in a home. Usually acoustic, usually with an audience smaller than 50 people, almost always with a suggested donation that goes directly to the artist, house concerts are always a lot of fun.
Folks who host house concerts do it for a of love for music, not as way to make money. Like us, most people open their doors to musicians with the hope that small acoustic shows will continue to be a part of American culture.
For more information on House Concerts and hosting:
A New York Times article on House Concerts.
A great site with a guide to hosting along with a check list.