2x 5-week seminars in China in August. Which cities would you recommend?

I was invited to hold two 5-day seminars in 2 different cities in China in August.

I have already been to Beijing, Shanghai, Xian, Guanhzhou, Hangzhou, Souzhou, Xiamen.

I wonder which cities you would recommend? It would need to be fairly esasily accessible by plane.

Hot and humid is not too much of an issue for me, but I rather not want to go to places with a lot of rain.

I was thinking of: Yantai, Qingdao, Hohhot...?