I'm going to a "business dinner". Is it business, or is it dinner? What am I suppose to wear? A gown or a suit dress? I didn't think I was sure to obsess about what I should wear, but the right look is important.

Help me please.

http://imageshack.com/a/img538/5066/uwYayp.jpg

http://imageshack.com/a/img911/8048/BTNd33.jpg