I think it was set the morning after Rachel's party, and all the New Directions and Blaine were there and hungover, asleep. Kurt didn't drink and he was upset (I think because of Blaine and Rachel kissing) and decided to drive home.
The New Directions woke up later and switched on the news to see news about a car crash and they recognised Kurt's car.
I can't remember if Kurt died or got better.
Also this is my first post so if I did anything wrong, I apologise in advance. Xx