I'm probably going to be yelled at or something for saying this, but the reason I didn't attend this year's Bash was because almost all the levels used MP3 Music, and since I don't have Plus, I was unable to play, so maybe I'm not alone?
Basically, next year, maybe we should stick to music that JJ2 natively supports, so that even people who don't know what this site is can still take part?

That might solve attendance(Although the community isn't exactly growing as fast as it used to, and with people leaving the community(Or, in Gus's case, being kicked out), we're having a net loss), but then there's the levels issue, which -- as the others have said -- can be solved with competitions and stuff like that.

And, as Stijn said, it might be a good idea to do various other events, like a Tournament, or something like that.

That's my thoughts on the matter.