There are two big concerts this weekend at the Maine Savings Amphitheater: country star Lainey Wilson on Saturday and legendary songwriter James Taylor on Sunday. On Saturday night, there’s a metal show at Queen City Cinema Club in Bangor, featuring Filth, A Wake in Providence, 9Dead, Resistor and I, the Conqueror. And there are two musical theater shows happening again this weekend: “Little Shop of Horrors” at the Penobscot Theatre, and “The Trail to Oregon,” a spoof of the beloved early computer game, at Some Theatre Co. at the Bangor Mall.