Mastodon headlines a North American run called “The Poisonous Weapons” tour, appearing at the Agora Theatre & Ballroom in Cleveland with support from Deafheaven and Alcest. The bill pairs Mastodon’s progressive/heavy-metal focus with the atmospheric, blackgaze-influenced sounds of Deafheaven and Alcest, offering an expansive evening for fans of heavy, experimental rock. The show takes place at the historic Agora Theatre & Ballroom, a longtime Cleveland venue for touring rock and alternative acts.