Mrs Mitchell was last seen leaving the family home by husband Chad Mitchell at 1am on May 3, 2010, after an argument over money.
Friend Sinki Nikolich, who met Mrs Mitchell 24 years ago, has organised annual vigils with Kim Skinner and Tammy Dewaayer each year since.
�We just want to know, everybody wants answers,� she said in relation to Mrs Mitchell�s disappearance.
She said the vigils were held to remind people not to forget Mrs Mitchell and to provide any information they may recall.
�The vigil will be the same as every other year, with a banner with her picture and a book that people sign to acknowledge that people haven�t forgotten about her.�
Through Facebook last month, Mr Mitchell�s brother Troy expressed interest in lobbying the government to offer rewards for information.
Mrs Mitchell�s friends will once again host a vigil for her in the park near her former home on Meares Avenue, at 5pm on Sunday, May 3.
Major Crime believe he mother of three was murdered but despite numerous searches, no trace of Mrs Mitchell have been found.
On May 9, 2010, police combed bushland opposite the home in Kwinana and on May 15, Mr Mitchell reported finding his wife�s wedding and engagement rings on the home�s front doorstep.
On May 24, police and cadaver dogs searched a quarry on Thomas Road where Mr Mitchell had previously worked.
In June, Mr Mitchell admitted in a 60 Minutes interview that he had spent money for the family mortgage on drugs.
In July that year, police raided the Mitchell home, removing items for forensic testing.
In October, police declared the investigation a homicide.
Anyone with information on Mrs Mitchell�s disappearance can call Crime Stoppers on 1800 333 000.