House concerts are more formal.   Basically it is a concert - given in someones home. Usually there is no amplification and the performer will play for an audience of 20 to 30 people. An admission is charged and the performer usually keeps all of it, minus expenses. Sometimes there is a pot luck associted with the event, or simple drinks and snacks (no alchol usually).

House concerts are growing in popularity here. The low key and intimate setting makes them fun to attend and a great experience for the performer.   It also helps to fill in gaps in schedules as well as opening up new opportunities to perform.