There's a big thread about the dessert parties that I had been watching and commenting on for a while trying to get an idea of it being worth it for my January trip. There's a lot of yeah its good, no its terrible and people say its hit or miss. Some say the late party is better because of your seats, but worse for the food. Some say days where there's only an early party is better. Honestly I don't know what to think.
I did end up reading though that for me it probably won't be the best choice because you can't book it as a solo traveler, you have to book (and pay) for two people and then call back and cancel the second person. Not worth the hassle. I'd rather go early, find a spot and get my own dessert.
https://www.disboards.com/threads/can-we-talk-dessert-party.3855046/