Tell me about the video of meeting my sister on my birthday.

First of all, if your host knows your people, you should understand why you really can't go; In that case, you must call Master to congratulate him and make it up to him afterwards. If I can't go because of economic problems or concerns, I won't say much. In this case, your master's position in your heart should not be so heavy, and you don't have to worry about losing his face. Just apologize, which means something is really wrong.