Mastodon, Deafheaven, and Alcest deliver a genre-spanning metal triple bill at Boston's Citizens House of Blues Boston, showcasing a spectrum from progressive sludge to blackened post-metal and shoegaze-inflected metal. The lineup brings three influential acts together for a night of intense, immersive performances. The venue anchors Boston's live music scene by hosting a marquee event that draws fans of heavy music from across the region.