Just came accross a user-generated content site that shows events worldwide, upcoming.org. After checking the events for Shanghai, I decided to sign up. In total Shanghai has 204 users and I hope it will be more soon. This is the kind of site I like, because you come accross events that might not be announced in other places. If you are bored (does not happen to me too often you just log on and see if there is anything going on in town. The site has RSS feeds for events in different cities, making it even easier to keep up-to-date. The events for Shanghai can be found here: http://upcoming.org/metro/cn/sh/sh