I get a kick out of driving through the old wealthy homes close to Christmas. I used to drive through the Indian Hills area of Fort Worth, but in recent years, I enjoy driving through the University Park homes in Dallas and for whatever reason, North Park Mall has always been a treat, so I try to stroll through in a non-shopping mode. Maybe it's just me and I warn that unless you know the Dallas area, University Park can be challenging to get around in to see everything. You might want to take a Dallas native the first time or two.
Great question! I may try some of these other answers myself!
PS....Just look up all these events on AOL CityGuide for Dallas/Fort Worth and there is a comprehensive listing!