Instagram/Disclosure & Lorde & Turn Music FORM Arcosanti returns Oct 2026! See Disclosure, Lorde, Turnstile, Tinashe & more in Arizona's iconic desert architecture. April 21, 2026 AceShowbiz - The FORM Arcosanti festival is set to return in October 2026 after a one-year break, unveiling a star-studded lineup on Monday morning, April 20. Leading the roster are British electronic duo Disclosure, pop sensation Lorde, and rock bands Turnstile and Geese.