On July 4, 1991 in Chicago, the Replacements played their final show ever, ending their run as one of the most celebrated (if not most commercially successful) alt rock groups of the 1980s. In the decades since, their legend has only grown. Last fall, Paul Westerberg and Tommy Stinson announced plans to reunite for a covers EP, “Songs for Slim,” to raise money for Replacements guitarist Slim Dunlap, who had a stroke. The EP was released commercially this year, and we heard its great “I’m Not Sayin‘” cover. Now, the Replacements have confirmed headlining slots at three Riot Fests in Chicago, Toronto, and Denver.