User blog comment:Deathmanstratos/February Poll/@comment-24373936-20140128070444/@comment-24373936-20140129063009

@Deathmanstratos K-On still attracts new fans. Just read in local forum recently, people are discussing about the live concert, how Mugi shines the most and Mio has to fake being a lefty.

Active users may be lacking, but how many lurkers are there? (mind sharing the quick stats? - i guess it tops 2000 hits per day).

The reason for lack of activity? there's nothing to contribute. I don't know your policy about non-canonical info, but maybe if you open a fan-art / tribute section people may showcase their then let the comments flood in.
 * cover video of some songs
 * canonical/original mixes of songs
 * devianart drawing / animated gifs
 * maybe even showcase/snapshots of their K-On figurines and such.