Not sure.
Lulu should have a new thread on MCM if there isn't already one - for her Chongqing to London trip. This event could kick it off.
Otherwise, I assume she is plugging it on motorfans and her weibo. If any MCM members on Weibo can be encouraged to 'retweet' (or whtvrtf the right word is) her announcement, that will help.
For the expat community I guess beijinger, timeout etc.
Good luck with it - as you say it is a very good cause.