I was called by Dining in Oct. for our Friday, Dec. 10, 2004. They closed the park at 6 PM. That was our MGM day too (we still went for the day and had dinner later elsewhere). We wanted to have dinner there and see the Osborne Lights. They moved the dinner for that night to another night, met us at the gate to get us into the park for free so we would not have to use a ticket, and they even offered us seats for Fantasmic (which we declined since we had a holiday caggiage ride to go to at WL).
I'd make my plans (and a back up plan), check with Disney dining, read postings here, and see if there is any information on Pop Warner's web sites if you can locate them, and hope for the best. Good luck.