Invitation to a music concert, Reciprocity?

Question:
I've accepted an invitation to a music concert; my hosts are providing my ticket. We will no doubt go out before the event. What are some appropriate and gracious ways of reciprocating and/or showing appreciation? Thank you.
Evelyn

Answer:
Certainly you should send a thank-note within a week of the concert and perhaps you could buy a bottle of wine for the table and have it put on your check if you go out to dinner before the show. The note is the most important thing.