I don't know when it opens but the Gaylord Texan has a really special holiday display.
Depending on where you are staying, the Galleria in Dallas has a 40 foot tree on the ice rink and a skating Santa with flames shooting out of the back of his skates. As much as I hate malls, that was a must visit every season.
The house decorations on Armstrong are something special. Those people go all out, and they can afford to, and there are so many making the tour that there are police out there every night to keep the traffic flowing.
Check to see if some of the smaller communities around the Metroplex are having celebrations because that can be a lot of fun. Has that small town feel in the area with 6.5M people.
Enjoy your trip and a TDay game with the Skins when it really matters is a special one to attend.