One word of caution for organizers: when setting up a house concert, be sure to ASK the performer whether he/she is allergic to cats/dogs. If there's an allergy problem, you need to find a cat/dog-free house. This has been an issue for some of our FSGW performers (and finding pet-free venues can be a problem in our furry-friend-loving group). Nothing worse than trying to sing when you're wheezing because of a cat-hair allergy. Similarly, you'll want to tell your potential audience in advance if there will be cats/dogs in a house concert venue.

House concerts, as Charlie said, are one of our most frequent Folklore Society events -- usually a couple a month. They remain my VERY favorite way to hear folk music: unamplified and shared in an informal, intimate setting.