:I think that we should say something about "Culture / Community" - certainly such sites exist, even if we need to trim some material as being speculation or unsourced. Also I don't see what's wrong with "It is not universally recognised, but it is a well known date within the grass-roots movement of self-injury awareness."?  
 I agree a "Culture / Community" section is necessary and would love see a well-sourced, non-POV one.