Insomniac presents two nights of BOO! at the Bill Graham Civic Auditorium on Friday, October 30th and Saturday, October 31st! Artists announced on October 30th include Flosstradamus, Oliver Heldens, The Magician, Ghastly, Shaun Frank and Dr. Fresch. October 31st includes Nicky Romero, Seven Lions, Snails, Kennedy Jones, DallasK and 4B. More artists announced every day this week!