I think this is all some kind of performance art stunt. I certainly would not do an english corner on short notice and have seen what can result of such a request. A fellow african FT was so angry at the Chinese teacher, it almost escalated into a fist fight. If the FAO/Chinese teachers used a bit more tact and timing when dealing with westerners, these things would not happen. Last minute requests may be acceptable in China, but acceptable to Westerners? Not for me, not now, not on my watch, not ever!