John's cousin Jack is going to visit John and his family on Mid-Autumn Festival. They will get together and have a big dinner. So John's family are busy this Saturday. John's father is going to the supermarket. He is going to buy some food and drink. John's mom will make mooncakes. John's grandma is going to clean the bedroom for Jack. Jack is going to stay here for three days. What is John going to do? He's going to write a poem about Mid-Autumn Festival. John and Jack are going to read the poem on Mid-Autumn Festival night.