I know my host is very busy, and I had a chance to witness it. On the 21st of June, he introduced one speaker at 8:45 am in one building, and walked me to another building for my lectures from 9-11 am.
I was not very well settled, because I had to speak from a raised stage with a microphone much too low for me to use. (I was told to sit down and teach, but I was not used to sitting while lecturing.) With me standing, I felt that I did not have good eye contact with my audience.
I tried not to be distracted by cool sea breeze or traffic noise from the street. Suddenly, my host asked the audience: "Do you all understand the point Yu Lao Shi just made?" Silence was the answer. I knew I lost my audience, the worst thing for any speaker. I went back a couple of slides, and repeated my teaching in Chinese.
When I finished both lectures, I was not getting questions. I didn't know what to do. My host came to rescue again: "Now, let's ask some questions. Start with you..." He practically made every one in the first few rows to ask a question. After that, students were more willing to ask me questions on their own... What a relief to me.
Thank you, my host. I have learned how to interact better with the audience from you!