It's well-known that in the making of the music of The Clash, Strummer was much more about the lyrics and Jones much more about the music. But overall, they seemed to share a focus on meaning, and when you do that, "genre" steps out of first place. Ultimately, their music wasn't so much about what they played, or even entirely about how they played (though both those things mattered to them, as to their fans); it seemed to be a whole lot more about why they played. So they played, in their unique style, almost anything -- jazz, punk, blues, rock 'n' roll, ska... -- whatever worked, provided it helped say or express what needed to be shared.
And when you listen to what Strummer did after The Clash you really appreciate how broad and eclectic his music continued to be. In fact, as Chris Saliewicz (I think it was him) suggested, his music seemed to be becoming a genre all its own. We've decided to call that Strummer Rock. Well? Why not?
Are you a Strummer Rocker?
Musically speaking, that's what Strummerfest is after. From punk rock to romantic ballad, from hard core to folk to blues to jazz to hip hop and even disco (well, okay, maybe we have some lines to draw somewhere, but we're not certain of where those are yet) -- there's a place for it here (subject, of course, to time allowances, space in venues and audience demands).
So, if you have a touch of Strummer spirit -- if what you say is superior to and dictates how you say it -- if you're into music primarily for the meaning of it (without neglecting the fun) -- you're right for us. Come join the parade.