Punk rock at Whiskey Dick’s

United Defiance, South Shore Riot and Bionic Gorilla play a 9 p.m. show tonight at Whiskey Dick’s Saloon. There is no cover charge for the 21-and-over crowd. United Defiance of Concord and South Shore Riot are both punk-rock bands, while Bionic Gorilla of South Lake Tahoe spills out hard rock and metal.