From Ozzy Osbourne’s Facebook page:
A follow-up post sets the table for a big announcement: Ozzfest meets Knotfest. Ozzy’s world crossed over with Slipknot’s signature event for a pair of shows last year, with Black Sabbath headlining one of the two nights.
… and this means we’ll know everything there is to know by the time the Prince of Darkness hits Chicago for Chicago Open Air next month.