Have you looked at a Navigator? If not you need to do a search and look and them. This will tell you what days are what on each cruise. I will PM you with some info.
I actually looked at a recent Navigator on Barb's site. That's where I saw the dress up night. Barb, if you read this, can you answer it? You're the expert.
You don't really need any dress up clothes at all. Nice capris/pants and tops are great for each night, including if you get a reservation at Palo. For men, nice slack/shirts, and for Palo, a jacket is no longer required just a collored dress shirt (no Tommy Bahama style shirts for dinner).
So pack light and pack casual, it is this way, even on the 7 night..although they have the formal nights still on the 7 night.
I was just on the 3 day Wonder - 6/16/05. On formal night, I saw one guy with a suit. Some ladies wore dresses, however, I would not call them formal. The majority of guests wore casual clothes -- slacks, capris, etc.
I was also on the 6/16 Wonder. We dressed up just because it was fun But I saw a lot of people in shorts and sandals. At least in our dining rooms I never saw but a handful of people dressed up.
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