LC Fashion has this absolutely GORGEOUS formal dress out for FREE! It comes with a fantastic necklace. So if you have something special to go to this would be perfect.
The skin is from Angeldust, its their group gift.
Skin: Zoe Holiday Glamour (Group Gift, Free) @ Angeldust http://slurl.com/secondlife/Jazz%20Island/146/211/22
Dress: Erisa (Free) @ LC Fashion http://slurl.com/secondlife/Insignia/152/57/23