Rejection is simple. Just say that the family hasn't decided whether the host wants to bother. Why don't you just ask him to come over another day while you think about it? As for the elders, that's easy to say. I'm busy recently, so I don't want to watch it. Let's talk about it later.
But then again. Feng shui can make people's lives relatively simple. It's not that complicated. Happiness is the last word.