tiger, you are right. I disliked the walk=in ECs as it was the same numbing questions over and over. Other ECs with an agenda also seemed to require someone to be the facilitator, native English speaker, who carried the load.

I tried to get Chinese to explain things to me like hukou, or, "Do you want to: 1) stay single, 2) get married and have a child, 3) be a DINK family, or, do they gay thing? Try, "Would you marry someone who is divorced?"

I would research topics well. Knowing what questions to ask helps. Try to spark disagreements and let them talk to each other as long as it is in English.

Sorry @yankee that isn't enough for me. I'm neither patriotic nor egotistical enough.

When and how to attend

Attend what? With most English corners, you just have to show up. Times vary, but are usually regular and weekly. Ask any university student.