The move has been undertaken by an Indian NGO, Malaysian Indian-Voice (MI-Voice).
Its chairman, V Raidu, said the reunion was scheduled to take place on April 30 at Dewan Hamzah, Klang, and was expected to draw 10,000 people.
The five masterminds are V Ganabatirao, K Vasantha Kumar, R Kenghadharan, M Manoharan and P Uthayakumar. They were largely responsible for mobilising more than 60,000 Indians under the Hindraf banner for a demonstration in Kuala Lumpur in 2007 to highlight the plight of the Indian poor.
In a police crackdown on the protest all five were detained under ISA. During the detention, there was a fallout between Uthayakumar and Vasantha Kumar.
Vasantha Kumar joined PKR while Kenghadharan and Ganabatirao are MI-Voice advisers.
Said Raidu: “I am hoping all five would join hands for the sake of the Indian community.”
Added Ganabatirao: “This will be the last attempt for a reunion.”
Ganabatirao, who is a DAP member, confirmed that DAP secretary-general, Lim Guan Eng, would be attending the function.
Opposition Leader Anwar Ibrahim and PAS spiritual adviser Nik Aziz Nik Mat are also expected to be present.