If you are flying on the 25th that is the day before Thanksgiving and THE busiest day of the year for Air travel. Expect crowds and delays if you are connecting.
Thanksgiving weekend, starting with 'Black Friday' ( shops finally go into the black) is the busiest time of the year, and the official start of Christmas shopping.
Everywhere is busy that weekend, if you are driving, traffic to shopping malls will be a long procession.... shops are packed, but the atmosphere is very festive, so don't dread it. I avoid malls like the plague that weekend but others in my family wouldn't miss it for anything.