The much-anticipated opening of CS13, a new eclectic arts and performance venue in Over-the-Rhine, is finally upon us. Saturday, starting at 6 p.m., CS13 will celebrate its inaugural exhibition Greetings from Cincinnati, which features more than 150 takes on Cincinnati through homemade postcards. Contributions from all over the country make up the exhibition. Starting at 8 p.m., a rotation of performances by Matthew Shelton, The Flux Capacitors, Order 66, Greg Hand, Moxy and Clark Wheeler will christen the space for regular concerts and performances. CS13 will also be releasing a small run of its first ’zine, entitled 39