No festivals in LA but I have attended a few show
2014: Exodus, Suicidal Tendencies(2x), Slayer(3x)
2015: Witchaven, Lord Dying, Tormenter, Toxic Holocaust(2x)
2016: Nervosa, Skeletal Remains, Night Demon, Gravehill, Ghoul, Terrorizer, Repulsion, Municipal Waste, Havok, Megadeth, Crytopsy, Abysmal Dawn, Obituary, Cannibal Corpse, Iron Maiden.
2017: Immolation, Testament(2x), Blood Incantation, Sadistic Intent, Suffocation, Morbid Angel.
2018: Nuclear Assault, Demolition Hammer