Tough one. It is a formal dinner at the end of a conference. Have yet to see the invitation to see what the specified dress code is, but DH tells me that last year (I couldn't go as babysitter fell ill) there was a mixture of what I would class as cocktail dresses (shorter) and black tie type floor lengths. He wore a dinner jacket from memory.
I had wondered about this dress styled in a similar way to the pics with unusual earrings etc...a bit younger and fresher than traditional evening wear.
I am also wondering whether I am just looking for an excuse to buy it cause I love it, so am shoehorning it into this event. 😄
At the other end of the spectrum I have also seen these (am a size 18 hence the plus size):
https://goddiva.co.uk/products/goddiva-bardot-pleated-maxi-dress-royal-blue-1
https://goddiva.co.uk/products/goddiva-plus-sequin-mesh-embroidered-maxi-dress-emerald
https://goddiva.co.uk/products/goddiva-plus-velvet-band-sequin-bodice-maxi-emerald
As you can see, I am a little hectic in my likes/dislikes.