Jacqui - don't get discouraged. That happens with some frequency and the best thing to do, once you've figured out that the audience hasn't come to listen to music and is there to eat, socialize and booze, is just treat it as a practice session. It isn't your fault - "casting pearls before swine" comes to mind. Sometimes you can salvage a little bit of the gig by getting the attention of a few music lovers, and sometimes you will be surprised by people coming up afterwards and telling you how much they enjoyed your music, even though you thought nobody was listening. But I agree with those who have said it's a rite of passage when you start taking on official "gigs". It will probably happen again, but then there will also be those magical moments when the audience is obviously enjoying and appreciating what you're doing.