The special service will take place at the Star of the Sea Church, Faughanvale at 7.30 pm.
It will be followed by a remembrance vigil at the Rising Sun Bar.
Seven victims died at the scene in Greysteel on October 30, 1993.
Three UFF gunmen walked into the bar and opened fired on patrons with an AK47 assault rifle and a 9mm Browning pistol, slaughtering innocent people on a Halloween night out.
Those who were murdered were James Moore (81); Karen Thompson (19) and her boyfriend Stephen Mullan (20); Joseph McDermott (60); Moira Duddy (59); John Moyne (50) and John Burns (54).
The eighth victim, Samuel Montgomery (76) died in April, 1994 after blood clots from leg wounds spread to his lungs.
Six of the victims were Catholics and two were from the Protestant community.
The utter revulsion felt after the eight deaths at Greysteel reverberated around the globe. T
hese heinous murders in Co Derry were part of an increasingly sickening cycle of tit-for-tat sectarian murders at that time.
In 1993, 88 people died with 63 of them being innocent civilians.
A week before Greysteel, the IRA planted a bomb in the heart of the Shankill Road in Belfast at Frizzell’s fish shop killing nine people.
The tenth death in that attack was that of Thomas Begley-one of the IRA bombers.
His accomplice in the attack, Sean Kelly, was badly injured in the IRA attack and was later jailed for life for the multiple murders.
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