The producer of the upcoming "An All Star Tribute to Michael Jackson [ tickets ]--King of Pop" has issued a press release expressing his dismay over Jermaine Jackson's decision to not participate in the event. However, according to published reports, he hasn't officially bowed out.

"I am sorry Jermaine has chosen not to participate in this event. This is an event for Michael Jackson. It is a salute to a truly great and legendary artist. Jackie, Tito and Marlon, original members of the Jackson 5, will join their brother Michael on stage for this very special reunion," said World Events LLC President David Gest. "I only wish Jermaine the best on his solo career and hope he finally gets the attention he so justly deserves."

According to published reports, Jermaine and Randy Jackson have not signed contracts confirming their participation in the event, to take place Sept. 7 and 10 at Madison Square Garden in New York. Gest made no mention of Randy Jackson in the press release.

Jermaine and Randy have stressed that they have every intention of partaking, according to Billboard Online, but in a press release, the two stated that they are upset that the top ticket price is $2,500 and that none of the proceeds are going to charity.

The show was scheduled to include a reunion of Michael with his brothers, who have not performed together since they toured as the Jacksons in 1984. The event will mark Jackson's first U.S. solo appearance on a mainland stage in 11 years. More than 250 celebrities are slated to attend the event at Madison Square Garden.

Confirmed performers include:

Friday, Sept. 7: Marc Anthony; Ray Charles; Deborah Cox; Gloria Estefan; Billy Gilman; Whitney Houston; James Ingram; Quincy Jones and the Legends of Jazz including Al Jarreau, Herbie Mann, Les McCann, David "Fathead" Newman, Jimmy Smith, Clark Terry and Cassandra Wilson; Monica; Mya; 'NSync; Jill Scott; Shaggy featuring Ricardo "Rikrok" Ducent and Rayvon; Britney Spears; Tamia; 3T; and Usher.

Monday, Sept. 10 : Marc Anthony; Mary J. Blige; Deborah Cox; Missy "Misdemeanor" Elliott; Gloria Gaynor; Al Jarreau; Gladys Knight; Lil' Romeo; Ricky Martin; Monica; Mya; 98 Degrees; Jill Scott; Usher; Luther Vandross; and Dionne Warwick.

Tickets go on sale through Ticketmaster at 10 a.m. on Tuesday, July 31. In an earlier press release, Gest said that tickets will range from $45-$500. However, published reports cite the highest ticket price as $2,500.

At the performance, Jackson is scheduled to debut a new single, "Invincible." The show will feature a 48-piece orchestra, 12 background singers, a 300-member gospel choir, 200-member children's choir and a 40-person dance ensemble. The event will be filmed as a two-hour prime-time special for CBS.