написать письмо-ответ по англ.яз. 
You
have received a letter from your Enflish-speaking pen friend Jane, who
writes "...Did you go to that festival you were telling me about? What
was like? I want to know all about it! In other news, it's  my sister's
birthday next week and I'm planning a huge surprise party for her..."

yes, we went on a festival. it was very cheerful and interesting. beautiful music played. we hope to your sister the huge party surprise for it will be pleasant.