Apple may not be attending, but Quark, Harman Multimedia and Xerox have announced plans to show up at Macworld Boston, which will run July 12-15 at the new Boston Convention & Exhibition Center (BCEC). Other companies already slated to attend are: Alias, Belkin, Brenthaven, Disc Makers, DriverSavers Data Recovery, Guitar Center, Harmony Remote, Hash, Iogear, O’Reilly & Associates, Parliant Corp., Peachpit Press, Prosoft Engineering, Roku, Sassasfras Software, Software MacKiev, Sonnet Technologies and Unitek.