2) Here is a list of what you can spend Masquing on. Note that the more expensive ones are not significant improvements, stat-wise, over the less expensive ones, and should be regarded principally as role-playing choices.
3) Speaking of which, I want the Monster-Hunting Academic because she's awesome. So I'm willing to trade for at least 30 Fate and up to 80 Fate (I could trade in last year's Luxuriantly Coiffed Sorrow-Spider, which I don't use, but I'd be willing to keep it in case it eventually unlocks something or you really need something; also, the Pirate Poet and the Ghostly Presence would be kind of cool just because). Those can be anything, since I'm going to trade them I don't care what. Just ask first in case I forget to update this post.
(Separately, I'd like a Hamper of Heart-Cuts, because apparently you can feed them to the Rose-bearing Maggot.)
The Feast lasts for two weeks, so there's no rush on this.
4) I'm still poking at the additional content in the Feast of the Rose card itself, but in case you haven't noticed, it has at least four different sets of options that appear at different times.