A Mass to commemorate those who died as a result of heroin addiction will be held in St Catherine's Church in Meath Street, Dublin this evening. The Mass will follow the switching off of lights on a Christmas tree in Pimlico at 5.45 p.m.
Families of the dead have put wreaths around the tree.
Ms Marie Stanley of the South-West Inner City Network said the organisation wanted to replace the tree with a permanent memorial and a flower garden to heroin victims.
"There was an awful lot of drugs sold there and used there over the years. People said we were mad putting up a tree - that it would be knocked, but it hasn't been touched."