Okay kiddo, do you know what a movie is? It's like a story that people can watch on a big screen. Glastonbury the movie is a special movie all about a really big music festival called Glastonbury.
At Glastonbury, lots and lots of different musicians play their songs for people to enjoy. It's like a big party that lasts for a few days. And when they made the movie about it, they wanted to show what it's like to be there and see all of the different performers play their music.
So, the movie shows people dancing and singing along to the music. It also shows some of the different stages where the musicians play their songs. And it even shows some of the behind-the-scenes stuff, like how they set up for the festival and all of the work that goes into making it happen.
So, if you really like music and big parties, you might like watching Glastonbury the movie!