There is a great chart
over at mousesavers.com that can provide you with what past promotions have been offered (and for when), as well as what's currently available to date.
However, our own Caldercup here on the boards just did a blog
this weekabout free dining, in fact, and the unfortunate (probable) chance that it might not
be given beyond September this year!
So, if you're looking for a discount for that time of year, your best bet will to keep an eye out for any announcements right around mid-summer.
P.S. The past two years, MVMCP has started the first full
week of November, which has, in the past few years, been November 8th in 2010 and on November 9th in 2011. So, if all goes the same for this year, your dates should work out perfectly!