Sure, it's an elegant affair, but you must also capture the essence and elegance of champagne and berries with bold colors accented with some sparkles. During the party, set the mood with some laid back tunes.
Decor
Try scattering white diamond drops around the tables for a bejeweled effect.
Use sugared berry garland for your table's centerpiece.
Hang twinkle lights around your party space
Use colorful flower napkin rings for your party's napkins to represent those yummy berries you'll eat.
Music
This little gathering may call for some sophisticated Spanish Guitar, but if you'd like to go a different way, open up your iTunes and try some of these jams for your after-dinner drinks soiree: