Luyện ngữ pháp - English Grammar in Use - Intermediate ((Unit 19: Present tenses))
Present continuous (I am doing) with a future meaning
He is playing tennis on Monday afternoon.He is going to the dentist on Tuesday morning.He is having dinner with Kate on Friday.
But the present continuous is more natural when we talk about arrangements. See Unit 20B
Present simple (I do) with a future meaning
Compare: