Down, Electric Wizard, Goatsnake, Fu Manchu, Obituary, Kyuss Lives, Orange Goblin, The Sword, Bison B.C., YOB, All Out War, Church of Misery, Big Business, Vision Of Disorder, Evile, Living Sacrifice, Corrosion Of Conformity, Noothgrush, Suffocation, Autopsy, Overkill, Enslaved, Shai Hulud, Immolation, Pestilence, Entombed, Death Angel, Lazarus A.D., Symphony X, Absu, Wolves In The Throne Room.
Realistic for most? No. But most of the bands are similar to High on Fire when it comes to the sub-genre and they don't have any other concerts during Mayhem Fest. I did send this list to Kevin Lyman, Paul Kersh and John Reese so we'll see what happens.