There was no official event for formal wear. On most normal cruises, there is a formal evening, but that wasn’t on the itinerary at all for the Halcyon. For a long time, we thought there was a formal evening. When I found out there wasn’t an official event, I almost considered not bringing my formal wear. But I’m so glad I did! Many people changed their outfits for dinner and we didn’t stick out at all (well, besides being pink). I know some people have been hesitant to bring costumes with them for fear no one else would be dressed up, but I’d say there was a majority who did somewhat dress up and a good chunk of us who went all out! But time is short, so make sure when you do have outfits to change that you can do so easily and quickly. Hubby made my twi’lek crown fairly last minute (since I had last minute decided to go as twi’lek instead of zabrak). I’m so glad he did because it really completed my look. It’s made mostly out of worbla and I could just interchange it on my cap for the other greeblies I made to go on my cap. All with velcro!