Most of the big crowds will be on Saturdays and holidays. Crowds should get bigger the farther it gets into December, but the last week should have less people than most other weeks. I promise you, at least 1 Saturday there will be at least 25,000, all lines will be using every long way they have, WF will be going upstairs (which means about a 3 hour wait), and it will be shoulder to shoulder traffic in practically every road. The smaller back roads in SDC may not be as crowded though. If possible, go on a weekday, but avoid holidays.