I know a lot of people worry about crowds for the running weekends, but I don't. Of course, I tend to participate in those weekends. And I know that the runners are generally tired sore and limping, and can easily be overtaken on the way to TSMM LOL.
But the week before will be the President's Day time, and I believe many east coast schools tend to have that week off, and THAT is a good reason why it might be busy ahead of time.
For me, for race weekends, we don't get in a week ahead of time; if we do that, I exhaust myself and make my stomach sick with restaurant foods. We get in in time for the expo and maybe an extra day of sleep, and we spend the bulk of any vacation time AFTER the running weekend.