英语作文 假如你是李云，你的好朋友John邀请你周六参加他的聚会，请你给他写一封委婉的拒绝信

Hi!john,I am very glad to meet you, I also want to go to your party, but, some things make me become involuntarily, my Saturday morning to visit my aunt, to go to art class in the afternoon, in the evening I have a lot of homework to do, I wish I could spare some time to come to attend your party, but, really sorry, thank you for your invitation, I hope you can have a happy night!
Sincerely yours
Li Yun