In social activities, people always emphasize punctuality and have a strong sense of time. If you don't keep your promise or come on time, it is very impolite to keep your host waiting. It's hard to imagine what would happen if there were a banquet, an interview or a meeting, but all the people involved didn't show up on time. If you are asked to meet a foreign guest at the airport or railway station, and you go too late, the guest has arrived before you arrive. How anxious and embarrassed he will be when he sees that no one is coming to meet him as a stranger! The same is true of the activities of seeing off foreign guests. What's the use of going to the airport or railway station if you arrive late and find that the guests have already left?

(para. 100). Therefore, as a host, whenever there is an activity, you should arrive at the scene in advance in order to wait for the arrival of the guests. Don't keep the guests waiting for you. This is very impolite. Those who help entertain guests should also come earlier than the guests. But when is the right time for the guests? You should be punctual. In other words, it is neither too early nor too late. If it is too early, the host may not have prepared the things. If it's too late, you can keep the host waiting. Anyone, whether a guest or a host, should apologize to those who have been late for social activities.

(para. 100). 3) After an appointment, under normal circumstances, don't change it, because it is impolite. If you have to change, you should inform that person by phone or in writing as soon as possible so that he or she can reschedule. Sometimes, the appointment has been made, but something unexpected has happened, and you don't have time to inform the relevant people. In this case, you should apologize to that person afterwards.