I was on the recent WBPC and attended Tiana's Supper Club. It was the first time they'd done it. $30, started at 11:15 pm for an hour. Included an "old fashioned" cocktail when arriving, and then they brought 3 mini martinis and you choose which of those you wanted another large one of. There were some light appetizers (all seafood) and desserts and the Brace Boys jazz band was playing. It was set up at tables around the center aisle in front of the band in the middle of the restaurant and people were dancing in that area. Willem and Natalia are the dance instructors who frequently are on the longer cruises and they started the dancing, but there were plenty of guests (including myself) dancing too. One of the entertainer magicians was there and was visiting (& I assume doing some magic tricks) at some tables, but he didn't visit mine - probably because we were dancing instead of sitting at the table. It was definitely targeted informally to those attending the dance class/sessions and mentioned at a few other times. Here are the drinks and the band.
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Somewhat blurry picture of Willem (dance instructor) and Natalie (cruise director) showing the basic set up:
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