The trio of Eight is scheduled to open Saturday’s show at the First Unitarian Church, which also includes Frankie Cosmos and All Dogs. The fledgling outfit is fronted by Mimi Gallagher (Year Of Glad, ex-Nona) and Cat Park (Amanda X, Bandname), and just shared its self-titled debut EP. The album offers a ripping glimpse at this new configuration, oozing with attitude and armed with a heavy bite, while constantly in motion.