Very merry christmas question from Australia

Hi, I am planning my wdw trip in October/November 2016. I am travelling from Australia. I am trying to arrange dates to attend the Halloween party and also the christmas party if possible. My question is; is there a pattern as to what day & date the christmas party starts on?

Usually the last Halloween Party is the 31st (sometimes the 1st- but don’t count on that). The first Christmas party is usually around the 8th. Buy your tickets early for both!

Thank you for your fast reply