What began six years ago as a smallish event in an office suite featuring visual art and music has become quite a production. Last year, Fusion sold out the Cannery within half an hour of opening its doors, which is why this year it’s also expanded into the Mercy Lounge. And, in terms of artistic media, the festival has really grown into its name, adding to the mix a fashion show and a festival of short films sponsored by Film Nashville. Designer Alain Patterson is showing his couture this year, and the musical lineup runs from surreally soaring pop (Mikky Ekko) to hooky folk-rock (Garrison Starr) and eminently danceable, slick-as-a-mirror-ball ’70s-style funk (Space Capone). It’s all for a good cause. Fusion benefits the Minnie Pearl Cancer Foundation. In fact, it happens to be the biggest young-adult cancer awareness event in the country.