It's an extraordinary meeting. In the audience are police who arrested members of this community, as well as those who have served time in jail on terrorism offences.
They are listening to the victims of the bombing talk, through tears, about the pain they have suffered.
In the audience is 33-year-old Zulia Mahendra. He was a teenager when his father, Amrozi, was arrested, sentenced to death and then later executed for the Bali bombing.
Amrozi was dubbed the "smiling assassin" by the media because he showed no remorse during the trial, grinning throughout and defiant to his death.