The church-affiliated group Citizens for Peace and Respect has asked Manson to cancel his June 21 appearance in Denver as part of the Ozzfest tour. The group includes teens and victims' families of the Columbine High School shootings, who say Manson's music glorifies hate and violence.
Citizens for Peace and Respect has planned meetings, rallies and a protest in the weeks before the show.
Manson, whose real name is Brian Warner, has not performed in Denver for two years. He canceled a Red Rocks Amphitheater concert scheduled a few days after the April 20, 1999, Columbine High School shootings after reports surfaced that shooters Eric Harris and Dylan Klebold were fans.