Call soon, interview spots fill very fast.
We scheduled 2 interviews on Friday (AM and PM), one on Saturday, two on Monday, and could see 5 schools over a long weekend. Obviously same day schools had to be close together.
It was very much worth it to see the schools. They are very different, and for some, they came off the list, while others surprisingly became favorites. We visited 12 schools all together. That was a lot.
Take pictures on the tour, make a file, and take notes as soon as you leave, because they all blur when you are done.