Please help! Dress options for cocktail party

I have an upcoming black tie wedding - I’ve got the dress for that BUT I need help with a dress for the party the night before. The attire is “cocktail” and it’s at a nice hotel. I’ve never attended a wedding of this caliber and will definitely be out of my element as there will be professional cheerleaders/pageant winners/etc. I know that I can’t compete with that, but I don’t want to look out too out of place. These are the options that I really like and think I would feel pretty in. Are any of these okay? Do I need something more elegant?

Disclaimers: I have scars on my shoulders that I don’t feel comfortable showing off, so covered shoulder dresses only.