Well I, for one, know he was there. He was interviewed and photographed both inside and outside Staples Center. It had been noted prior to the event that Rev. Jackson was not named on the list of speakers.
Further noted after Rev. Sharpton's speech, was the cold shoulder given to Mr. Joe Jackson by Sharpton when Michael's siblings embraced Sharpton and Joe's advances were brushed aside numerous times. Rewatch the Memorial video if you don't believe me.