The idea is that you have one interested person be the Host at their home and the participants show up with a book that they’ve read, a bottle of wine that they like and an hors d’oeuvres and their own personal drinks for the evening.
Each person then gives a short synopsis of their book and their wine while enjoying drinks and nibblies. The idea is that if you are interested in one of the books then you take it and the wine home with you. If no one likes your book then that is fine. You can still go home with a new book and wine even if yours wasn’t picked.