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Newly minted local metal act Unholy Orifice — possibly named after the trepanning spout at the cervical base of my skull, which I use to excise most of the memories from my adolescence — is graduating tonight from fast-rising local opener to bona fide recording artist with a demo release party at Siren's Song at 7 p.m. Along for the ride are local amp-burners Ultramafic, Knot Ewe and Racket. ($5).