Where did everyone go?

I'm wary of even mentioning this for fear that it will jinx my commute home, but...

The past two days, on my commute to and from work, the Red Line has been surprisingly empty. There are people on the train, but there were seats available during rush hour. Even after the stops where a lot of people board seats were still available.

Where is everyone? Are people not going to work this week? I understand it's a holiday weekend, but still. I feel like I'm in the Twilight Zone.