Michael Jackson’s mother and four of his siblings announced Monday a tribute concert for the late pop singer to be held in Wales in October, but the lineup for talent is still a secret.

Brothers Marlon, Tito and Jackie, sister La Toya and family matriarch Katherine Jackson attended the “Michael Forever The Tribute Concert” announcement at the Beverly Hills Hotel on Monday morning.

But the announcement exposed a major rift among members of the Jackson family, especially with Jackson brothers Jermaine and Randy, who did not attend the news conference. They objected to the show because it’s scheduled to happen during the criminal trial of the doctor accused in Michael Jackson’s death. “While we wholeheartedly support the spirit of a tribute that honors our brother, we find it impossible to support an event that is due to take place during the criminal trial surrounding Michael’s death,” they said.

While the head of the British company promoting the show, Global Events Live, hinted it could include a Jackson brothers reunion, the statement from Jermaine and Randy Jackson on Monday indicated that would not happen.

La Toya Jackson said the “tribute will be something that’s spectacular” and is “far, far, well overdue.’

The Jacksons’ mother called it “a show fit for a king,”

“If my son were here today, he would feel the same way,” Katherine Jackson said.

The show will “feature the world’s most amazing music performers,” according to the head of British promoter Global Live. The roster will be revealed online one act at a time over the next two weeks, starting Tuesday, Chris Hunt said. All profits from the show would go to several U.S. and British charities, including a cancer group created by the prince of Wales, Hunt said.

The October 8 show, in the Wales Millennium Centre in Cardiff, Wales, would be at least four hours long, Hunt said. The venue will seat up to 75,000 people, he said.

Hunt presented the Jackson family with a $100,000 check that will go to a trust fund for Michael Jackson’s three children, which they can access when they turn 21. The children, Katherine Jackson and unidentified charities are the sole beneficiaries of Jackson’s wealthy estate.