it's a Saturday with the Christmas stuff. It's going to be packed. This one might be lighter- you might get to use the parking lot instead of parking 3 miles down the road- but honestly if you're going to go on a Saturday you're going to have to deal with huge, heavy crowds and long lines.
I can not recommend strongly enough, do not go to SDC on a Nov or Dec Saturday. Friday nights and Sunday nights are better, though still busy. But they are manageable, especially in November. But if there is any way at all possible, go on a Wednesday or Thursday. You will have a much, much better day.
I basically agree with this, although I went on a Saturday a couple of weeks ago, which was (and I think still is) the coldest day we've had this Fall (high 40s and a bit windy, although it was sunny). While it was pretty crowded, ride levels were not at all bad. We didn't do any shows that time though, so it really depends on what you are planning to do.