Teaching Chinese ESL teachers a whole week seminer...NEED HELP!

Hello,
My name is Brenden Barritt,
I am currently living in Beijing, China.
I am being sent by my school to teach/speak in Changzhou China for a one week, 5 day training session for ESL teachers in 7 days...only problem is I've only been officially teaching for a little less than 5 months and have very few ideas for activities to get the teachers speaking English, as that is the main objective of the 5-day session.
I have over 50 students in a large lecture hall. I need some ideas of activities that don't require too many materials or movement as it is limited in the lecture hall. The main focus is on spoken English.
Any help would be greatly appreciated. :)