The Observatory in Santa Ana is the kind of venue where the crowd can see the sweat and the setlist changes feel personal. The Casualties & The Adolescents: Detonate Tour Oc performs at The Observatory in Santa Ana on May 24, 2026. Doors at 5:00 PM, show at 5:30 PM, All Ages. Live shows at rooms this size leave a different imprint than arenas — the ones who go remember the set list; the ones who don't remember the night they said no.