Blend in or stand out?

I have a wedding in New Orleans in early April. I need to buy a dress, but I'm unsure if I go with Door 1 or Door 2.

Door 1: Simple black dress, nothing loud or wild. I'm a +1 and don't know many people. This isn't about me and I should just blend into the background.

Door 2: It's a NOLA-style spring wedding! Have fun with it and be colorful. Don't be lame!