You've seen Ozzfest. You've seen Knotfest. But are you ready for... OZZFEST MEETS KNOTFEST???

That's right. Ozzy Osbourne teams with mall-metal giants Slipknot (who have played various Ozzfests) for a joint festival this year at San Bernardino, CA's San Manuel Amphitheater and Festival Grounds on September 24 & 25. Day 1 is Ozzfest day, with Black Sabbath headlining, plus thrash vets Megadeth, prog-metal greats Opeth, metalcore vets Hatebreed, Dave Lombardo's new band with Locust members Dead Cross, NOLA metal vets Goatwhore, neo-thrashers Municipal Waste, Canadian death metallers Kataklysm, metallic hardcore band Nails and more.

Day 2 is Knotfest day with Slipknot headlining, Dave Lombardo's former bandmates Slayer, Slayer's upcoming tourmates Anthrax and Death Angel (yes, that means Metaliica is the only Big Four band not playing this weekend), more veteran thrash from Overkill, Swedish melodeath dudes Amon Amarth, and more.

Both days honor Lemmy with a Lemmy Stage. Tickets go on sale May 20 at 10 AM PST. Full lineup below.

In related news, we mentioned earlier today that you can get a deal this week through next on $20 Black Sabbath tickets at certain stops of their "final" tour.

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Ozzfest Meets Knotfest -- 2016 Tour Dates

OZZFEST Line-up
Saturday, September 24

MAIN STAGE
Black Sabbath
Disturbed
Megadeth
Opeth
Black Label Society
Rival Sons

LEMMY STAGE
Children of Bodom
Hatebreed
DevilDriver
Goatwhore
Huntress
Dead Cross

NUCLEAR BLAST STAGE
Municipal Waste
Kataklysm
Nails
The Shrine
Still Rebel

KNOTFEST Line-up
Sunday, September 25

MAIN STAGE
Slipknot
Slayer
Amon Amarth
Anthrax
Trivium

LEMMY STAGE
Sabaton
Suicide Silence
Overkill
Emmure
Butcher Babies
Man with A Mission

NUCLEAR BLAST STAGE
Whitechapel
Combichrist
Death Angel
SIM
ONI