Actually each party has its own version of Wishes. There were dessert parties last year during the hard ticket events but no info yet this year. Some have said they think it takes too much time from the overall party to justify the cost.
There were no dessert parties during the Halloween party - but there were during the Christmas party. Those were limited to guests who purchased tickets for the Christmas party. And yes they do have Wishes - either HalloWishes or Holiday Wishes.