That sounds like a terrific birthday! I love your plans... Erin McKenna, GF Tea, and MNSSHP is the perfect combination!
As far as characters at MNSSHP goes: Disney announces the entertainment offerings at the beginning of August, but as a general rule, we have to wait until the first MNSSHP arrives to
actually find out which characters are going to be out meeting every year. Disney is highkey extremely annoying about it
However, we can speculate that these characters, which have been appearing pretty frequently at MNSSHP over the course of the past few years, will be out:
- Jack Skellington & Sally
- The 7 Dwarfs
- Winnie the Pooh, Piglet, Eeyore, Tigger (in their Halloween costumes)
- Donald, Daisy, Minnie, and Goofy (in their Halloween costumes)
- Tarzan, Terk, and Jane
- Cruella De Vil
- Aladdin & Abu, Jasmine & Genie (switching out in the same location)
- Jafar (by his lonesome, off to the side of that location)
There are quite a few others, Disney is pretty generous with the characters at this event, but I would be extremely surprised if this entire list specifically didn't make it to the Halloween Party this year.
Jack Skellington & Sally and the 7 Dwarfs are the hardest characters to meet at this party. I recommend making the choice between them, because it's very hard to meet both at the same party. CMs will allow guests with wristbands to enter the queue to meet them as soon as wristbands are distributed, which is around 4:00. By the time the party actually starts at 7, the lines are up to a 2 hour wait.
I would pick one, and then get in line as soon as you're allowed to. The great news about both of these M&Gs is that they're so popular that Disney has started allowing them to meet guests before the party actually starts! Jack & Sally came out an hour and a half before my first MNSSHP started in 2016, and the Dwarfs came out an hour before the party started the second time I went. So you'll still be waiting around 2 hours,
but you're not wasting any party time!
The Winnie the Pooh crew is another busy M&G. During the middle of the party, I got in line and waited about an hour and a half. The other characters were really great, I met so many characters at both parties and I don't think I waited more than half an hour for any of the others! I highly recommend Jack Skellington & Sally, Cruella de Vil, and Tarzan, Terk, & Jane! Jack Sparrow is also fun, but he greets day guests in MK now, so you can meet him then as well. Hope this helps!!