Stephen King is in full force again — not just writing, but performing. The thriller king was part of the Rock Bottom Remainders, an all-star band that yesterday in Denver kicked off a three-city tour to raise money for children. These aren’t just any all-stars, mind you (the Remainders — which is a publishing industry term for books that don’t sell — in their name should be a hint), but all-star authors: Dave Barry, Amy Tan, Mitch Albom, Kathi Goldmark, Ridley Pearson and Scott Turow. Roger McGuinn of the Byrds and “The Simpsons” creator Matt Groening are also expected to sing along on the tour. “I’m here to represent the discipline of writing,” Tan announced at a news co nference for the group that was covered by the Associated Press. Onstage, she carries the whip when performing “These Boots are Made for Walking.” Proceeds from the concerts are slated to go to local branches of America Scores, which supports after-school soccer and writing programs for inner-city kids. Tomorrow, the Remainders are due in Boston and, on Friday, in Washington, D.C.