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To my knowledge, no one in Alexina has gotten the dress through the banquet, and I was in almost every one of them up until G13. as for the ancient book, no confirmation. I've turned in dozens of complete books and have gotten nothing so far.
It's roughly a 5% chance, and it's only for the HM/Elite book (Prophecy). Also, I've seen somebody get it in the Tara Banquet in Mari.