Have you been to a taster evening before? Are you worried about what to take?
I like these evenings best of all, find them very enjoyable and learn such a lot! Not everybody cooks, we can always bring fruit like grapes or fruit salad, which can easily be shared, or a box of salad or cherry tomatoes, even make up a packet of cous cous, eg the Ainsley Harriott ones, or a Batchelors Pasta n Sauce or Savoury Rice - chances are that people will be pleased to taste them before they consider buying them themselves!
All I would add would be to LABEL what you take, with its SYN value, so that everyone knows what it is!
Good Luck with your stone award - do hope that you have a good evening!