Jack,
I am very sorry . I can't visit you on May 13.Because my school has insteresting activities. They are computer dermonstration ,poetry reading, choir concert, parents vs students volleyball match. I want to play volleyball with my parents ,that will good for my parents and I.So,I am sorry to you .But you will be free on the 2ed afternoon ?If you are free . I am going to visit you next day afternoon.