Three days doesn't give you much time to prepare. Having spent a year in Japan during my youth, I can vouch that there are lots of ways to inadvertently play the ugly American. As a Chinese, you probably are a few steps ahead on my clumsy Western ways from those days. Above all be polite and respectful. Avoid sensitive topics (sex, politics, religion) and don't let a few shared drinks deter you from this. Avoid body contact beyond a handshake. Most importantly, be open and authentic. I suspect you'll get better advice if you repost your question with a 'learning Japanese' tag to get the attention of native Japanese on the site. Good luck.

I have also recently read that business cards are very important in business with the Japanese. The business card should be treated with respect and not folded in half and shoved into your pocket.