Katherine Jackson -- Save The Wrong Date

Katherine Jackson says she's going to the MJ tribute concert in Vienna on the 29th -- only problem, the show's on the 26th.


As TMZ first reported, the family isn't happy about the show and nobody except Jermaine was planning on attending -- but now it looks like Katherine drank the Kool-Aid and will go, granted someone tells her the correct date.

We'll see if she actually makes it ...