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Organisers said 40,000 tickets have now been sold ahead of Saturday night's stadium concert in Cardiff in memory of Michael Jackson.
Although 10,000 tickets remained for the show at the Millennium Stadium they were confident of an eventual sell-out.
Christina Aguilera, Cee Lo Green and Smokey Robinson are among performers, while Beyonce will sing via video link.
Marlon, Jackie, Tito and La Toya Jackson will also pay tribute to their brother.
Chris Hunt, head of organisers Global Events Live, said: "I'm excited about tomorrow's event, especially with ticket sales going so well."
He added that, although there were still tickets left "we hope to sell out on the day" and reach the event's 50,000 capacity.
"Buzz is really building and some key acts have already been spotted in the city. Doors will open at 4pm tomorrow for what will be a fantastic evening," he said.
Michael Jackson died aged 50 in June 2009, during a rehearsal period for his This Is It tour.
The Michael Forever concert has been criticised for coinciding with the trial in Los Angeles of the singer's physician Dr Conrad Murray, who denies involuntary manslaughter.
Randy, Jermaine and Janet Jackson have confirmed they will not be attending the event because of the "bad timing".
But brothers Marlon, Tito and Jackie and his sister La Toya will be in Cardiff.