A commemoration stone is set to be unveiled at the site of a UVF bombing that killed six people 40 years ago.
The loyalist terror group threw a canister bomb into the Rose and Crown bar on Belfast's Ormeau Road on May 2, 1974.
Five people were killed in the blast, with a sixth man dying days later from his injuries.
A 75-year-old man lost a leg and another an arm. All of those killed were Catholics.
A Mass will take place at St Malachy's Church on Alfred Street in the city at 6pm tomorrow.
The commemoration stone in memory of those killed will then be unveiled outside the bar at 8pm.
Victims campaigner Jude Whyte will be the guest speaker at the event, which will include a minute's silence.
Two 16-year-olds were subsequently jailed for the bombing.
Organisers said they expect a significant turnout for the service and unveiling.