The Parades Commission is scheduled to conclude its deliberations on the Drumcree parade dispute this week.
On Wednesday, commissioners will hold separate discussions with representatives from the Orange Order and various political groups.
Among those attending are Sinn Féin and the Democratic Unionist Party (DUP).
TIDES Mediation NI, a Belfast-based organisation, was appointed last month to facilitate these negotiations.
The body tasked with resolving the conflict began its operations in 1998 following decades of tension regarding public processions.
A decision regarding whether the route will be altered may not be revealed until Friday morning.
The Orange Order has indicated willingness to engage with the proposed mediation framework.
However, a coalition representing local residents is requesting that an international mediator lead the process.
This dispute traces its origins to the mid-1990s when it nearly caused a breakdown in the peace process.
Garvaghy Road remains one of the most contested parade routes across Northern Ireland.
The planned procession is set to commence at Drumcree church at 13:00 BST on Sunday.
It is expected to conclude at Carleton Street within Portadown town centre by 14:30 BST.
The commission must determine if the route can remain unchanged or if a re-routing is necessary.
Residents have challenged the previous refusal to permit a march down Garvaghy Road for over thirty years.
The main thoroughfare in question is predominantly inhabited by people from nationalist backgrounds.
No further details on specific conditions were provided during preliminary exchanges.
The final ruling will depend entirely on the outcome of the scheduled talks.
The commission's role is to defuse tension while ensuring all parties feel their concerns have been heard.