Premier Iain Rankin is scheduled to attend the event, organized by the Nova Scotia Remembers Legacy Society.
The anniversary was also expected to be marked by a peaceful march to the RCMP detachment in nearby Bible Hill, where some of the victim's relatives planned to express their dismay with the Mounties' response to one of the worst mass killings in Canadian history.
Meanwhile, the flags at the provincial legislature in Halifax were lowered to half-mast at sunrise this morning and will remain that way until sunset on Monday.
As well, a series of memorial walks and a fundraising run were to be held in and around Truro today, with money raised going towards a permanent memorial.