As both of the previous posters indicate, DDP is a package. It is NOT a menu item you select or don't select. It's a marketing tool designed primarily to encourage guests to stay and eat onsite.
So...if you are getting a great convention room rate, you'll probably not be eligible for DDP.
I have a similar situation coming up this summer where I have a bunch of friends conventioning at CS. If I go up, I'll be doing the DVC/DDP thing, but that won't mesh with their plans.