MC Hammer is risking serious bodily injury -- because the rapper has agreed to perform at the 2011 Gathering of the Juggalos ... just one year after TWO performers were brutally attacked by fans.
The Insane Clown Posse -- the group behind the GOJ -- just announced the return of the 4-day concert via YouTube ... with a line-up that includes MC Hammer, Psycho Jesus, and Lil Wyte.
Tila Tequila and Method Man were featured performers at last year's Gathering -- but each left the stage dripping with blood after fans went ballistic ... and pelted them with rocks and beer cans.
The concert is set to go down in August -- leaving Hammer with a whole 2 months to change his mind ... unless he really needs the money.
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