on october 31, 2009, odadjian hosted the event "halloween" at the roxy, in which he and fellow system band mates daron malakian and john dolmayan reunited to jam on stage and perform various songs together, including system of a down's "suite-pee." the system of a down trio also came together on november 20, 2009 and performed system songs together for a benefit honoring coma-stricken chi cheng of the deftones, with chino moreno of deftones singing on lead vocals.