Read the following context and answer the question.
Context: I decided that since school starts here tomorrow , it 's time to change my theme from summer to school . It wo n't be long and I 'll be putting up my fall themes . It 's kind of weird to see it getting dark so early . I always think back to Independence Day and it seems to take forever for the sky to get dark enough for fireworks .
Question: Why is the narrator changing their theme ?
Answer:


Summer is over .