Thursday, May 26th- It IS- Blueberry Cheesecake Day, Paper Airplane Day, Sorry Day The series finale of This Is Us on Tuesday had 6.4 million total viewers. That's the most viewers the NBC show has had in nearly two years. Stranger Things will be broken up into two volumes. Volume 1, which premieres tomorrow, will have seven of the nine episodes with each episode lasting about 75 minutes. Volume 2 comes out July 1st and will have episodes…