Just to clarify a bit further...if they release a free dining offer (or any other discount) for the dates of your visit, it doesn't get automatically applied to your reservation. You would need to call and ask them to apply the discount.
Free dining is only offered for a specific number of rooms at each resort for that date range, so when those rooms are booked up, the discount is no longer available for that resort.
I'm going to move this over to the Codes & Rates board for you.