The sisters and partner of murdered Belfast man Robert McCartney will receive the inaugural Michael Davitt Justice Award today at the Humbert Summer School in Co Mayo.
The women started a campaign in January after the fatal stabbing of the father of two by alleged IRA members.
Claire, Donna, Catherine, Paula and Gemma, as well as Mr McCartney's partner Bridgeen Hagans, won widespread political support in Dublin, London, Brussels and Washington.
School director John Cooney said he believed the courage and resilience of the women finally persuaded the IRA to end its armed struggle.
"Everybody was hugely impressed by the strength of the McCartney women in the face of IRA intimidation, and it served as a wake-up call for republicans," he said. "I believe their campaign contributed to the IRA's historic statement at the end of July."
The IRA's July 28th statement called on volunteers to dump all arms and pursue a political and democratic path.
The 19th annual summer school in Ballina commemorates French republican General Jean Joseph Humbert and Irish Land League founder Michael Davitt.