A planned Michael Jackson tribute concert, supported by the late pop star’s mother and four siblings, was in disarray Thursday.

Tickets for the show, scheduled for Cardiff, Wales, in October, were to go on sale Thursday, but instead of providing a link for purchases the promoter’s website asked fans to “Please Standby for further announcements.”

The head of the British company promoting the concert promised last week it would “feature the world’s most amazing music performers.” The roster would be revealed online one act at a time over the next 10 days weeks, Global Live Events CEO Chris Hunt told reporters at a July 25 news conference.

“Everybody’s in the midst of signing contracts so nothing can be announced until that happens,” Juliette Harris, spokeswoman for Global Live Events said late Tuesday. She suggested an announcement would come Wednesday.

By Thursday, still no acts had been announced.

The problems started soon after 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 July 25.

But Jermaine and Randy Jackson, the only brothers not at the news conference, issued a sharply worded statement that reflected a deep division within the Jackson family over the show.

“We want to make clear that this does not reflect the position of the entire family,” the two brothers said in a joint statement.

“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.”

The Michael Jackson Fan Club agreed with the two brothers, issuing a similar statement.

Jackson fans posted messages on the concert’s Facebook page questioning ticket prices and the process for buying them.

Fans must place bids for a chance to buy a ticket. The higher their pledge to a charity, the better their chances of getting a good seat.

“The ticket system is so bad!! the higher you bid the better seats you get?? not every Michael fan is rich!!!” one fan posted on the “Michael Forever Tribute” Facebook page Thursday.

After several days of such negative posts, a link to the Facebook page was removed from the concert’s website.