Be Punctual
It's advisable in most cultures to be punctual, but in China, it means to be ready on the dot. In America, being early to a meeting or engagement would tell people that you're eager and ready to go. In China, it could be interpreted that you're trying to rush things along or that you're trying to assert yourself to be the bigger person.
Being late is the same idea. You don't want people to wait around just for you. That would tell people that you don't value their time, which is the same thing in America. Basically, prepare to show up on the dot!