I am very glad to have a friend like you. We all know that Christmas is a very important holiday for young people in the United States and China. Therefore, we are going to make a great progress in your study A Christmas party will be held in our auditorium on December 12.
There will be many games and lots of food and drink. Students and teachers will also perform for you. I'm sure you'll like it.
I'll pick you up at your accommodation building and my PMA. I'll call you when I get there. If you can join us, we'll be very honored.
中文翻译：
亲爱的简，你已经在上海大学学习了快几个月了，作为你的同学，我很高兴你在学习上取得了很大的进步，我也很感谢你对我英语的帮助，很高兴我有一个像你这样的朋友，我们都知道，圣诞节对美国和中国的年轻人来说都是一个非常重要的节日，因此我们将于xx月xx日在我们的礼堂举行圣诞晚会，届时将有许多游戏和大量的食物和饮料，学生和老师们也将为您表演。我相信您会喜欢的，我会在您的住宿楼和我的PMA接您我到那里后会打电话给你，如果你能加入我们，我们将非常荣幸。