You don't have to remember Milwaukee's legendary punk band The Haskels to head over to Shank Hall to see Polkafinger and The Blackholes Power Polka Machine, at 9 p.m. Friday. Although Polkafinger's Richard LaValliere was the singer and bassist for The Haskells and later the equally fine Oil Tasters, you don't need any of that background to enjoy the Brooklyn trio's punk rock polka.