The Northern Ireland High Court last night rejected an attempt by nationalist residents to block a junior Orange parade from the Garvaghy Road in Portadown.
Three judges refused an application challenging a decision by the Parades Commission allowing the march to go ahead.
Lord Justice Nicholson said the judges were satisfied that the Commission had acted properly and the applicants had failed to prove otherwise.
The parade, involving about 40 young Protestant boys, will now go ahead as planned tomorrow.
A strong security presence is expected on part of the Garvaghy Road as the junior lodge marches along a section of the contentious Drumcree parade route.
Mr Breandan Mac Cionnaith of the Garvaghy Road Residents Coalition said he was disappointed at the decision, but appealed for nationalists to remain calm.
"We are very concerned about the timing of this march, taking place in the evening after a Celtic versus Rangers match. But we have asked people to remain calm and that any protests will be peaceful," he said.
The parade will proceed along a short distance at the end of the mainly nationalist Garvaghy Road before entering a largely Protestant area.
Nationalists, who have hardened their stance on all Orange parades in Portadown in the run up to Drumcree, had demanded that the march be re-routed.
A spokesman for the Parades Commission welcomed the decision of the High Court on what he described as a very complex issue.
"We hope that tomorrow's parade will pass off in a dignified and peaceful manner," he said.
Tension was running high in Portadown last night after loyalists appealed for supporters to assemble on the lower Garvaghy Road, "to protect the Junior Orangemen from Republican attack".
Last year, following a similar parade, serious violence broke out when nationalist residents protested against the presence of the junior Orangemen in the area.