Thursday is the NT Live broadcast of the show at cinemas around the country and they're putting up a big screen in the square outside the theatre.
Many of the London cinemas are already sold out, and queues for day seats at the National itself are starting at 5.30am.
On Thursday next week you can just turn up, grab some Astroturf space and watch the show live.
The cast will do the curtain call outside for the crowd and there'll be dancing and music from the show before the performance.
Turn up at 5.30 to bag your spot and enjoy the music. The show starts at 7pm.