I am assuming you are on one of the cruises. The sail away party is up on deck, it's loud and packed, so I don't think it matters what you are wearing...the thing to do is if you are with a group is to stay together as you get on deck or you will never find one another. The pirate party was alot of fun, and there were lots of people dressed up. That was held on the St. Thomas day for us, and I remember they couldn't book our VR that day because it was a port day...it would have been our actual anniversary so it would have been nice...but I digress...I think, because it is late enough you could go after Palo, and depending upon how many people you have with you, you could really woop it up....and to have some pictures of you in your dress with fireworks above...now that would be cool.
Hope this helps.
cheryl