回复：周末收到了INTERVIEW信,时间竟是下周一,不服不行啊

So, the notice date and the interview date is really close (within a week or two?) If yes, don't worry.
You do need to go to the interview, and show officer the two dates and anyone will agree it is only reasonable that you need more time to prepare. So the officer is going to accept that you send other documents later.