ESPN Zone is great, Ralph's JK is simply exquisite, of course referring to DtD there are also Tortilla Joe's, House of Blues (not too family oriented), and Naples Ristorante'. Or of course Catal; but that is on a different plane of what to look at for a large group.
Of course you could eat at the hotels; Goofy's Kitchen, PCH Grill, Storyteller's Cafe. I am not sure about each place's ability to accomodate such a large group, but I am sure they see groups like that all the time there.
Like I said, Jazz Kitchen is EXQUISITE, the food is amazing, and the service is pretty good too; not too mention the "jazzy" atmosphere.