The deal called for Jackson not to perform elsewhere before the event or for at least three months after it. The lawsuit says Jackson, manager Frank DiLeo and event promoter AEG broke the contract by signing to do a series of concerts in London this summer, which may also include a pay-per-view event.
"We've given Michael Jackson and AEG every opportunity, publicly and privately, to resolve this matter and to date we have not heard from anyone," said Patrick Allocco, Allgood managing partner.
Allocco said the last contact with either camp was May 22 in Beverly Hills.
Representatives for Jackson and AEG could not immediately be reached Wednesday.
Allgood attorney Ira Meyerowitz said the company isn't looking to stop Jackson from performing.
"What were looking for," Meyerowitz said, "is for our clients to be involved in the London concerts or be compensated for agreements they entered into."
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