It’s not cheap keeping a local venue up to code, especially during the winter, when heating bills can be nearly crippling. That’s why a quartet of local rock bands—as well at the outsider theatre group Insurgent Theatre, no stranger to performing on bills with rock bands—are hosting The Borg Ward Hypernation Fest tonight at 9:30 p.m. at Linneman’s to raise money for the Borg Ward, a small but important venue that has quickly become the heart of Milwaukee’s all-ages music scene.