I would google/search forums for 'natural hair wedding styles' because a lot of them I think are really beautiful and would work for any occasion if you leave out the wedding-like white/ivory hair accessories. Make a short-list and take it to your stylist for their recommendation or diy if you have the skills (I don't).
However, sometimes the simplest things can look special if accessorized well. e.g. a neat bun if your hair can stretch into a bun.
I find many textured styles to be ridiculously elegant, so for me special doesn't mean straightened, but many ladies will straighten their hair for a special occasion so that's another option.
My hair is in the 4s, low in porosity, high in density and coarse.

Love: QB - all of it, Bobeam - shampoo bars, Darcy's Botanicals - Pumpkin Seed Conditioner, Coconut Cupuacu Pomade, KBN - Shealoe Leave-in, Oyin - Juices & Berries, Kinky Curly - Knot Today, Ayurvedic treatments, my Denman and the cloud of kinky goodness on my head that I get to play with!