I realllllllly might have messed up, and I am hoping someone will have some advice.

My older daughter turns 6 on Halloween, and asked that instead of a birthday party, that when we go (on our first!) Disney trip, we do something to celebrate her. We are going from October 12-15 and I was planning to get Halloween Party tickets, but I just went online and discovered they are sold out on there. So my question is--do they ever release any more to the public or am I SOL? I waited so long on this, and feel terrible! Gah!