Late Saturday, Northern Ireland's Court of Appeal lifted the High Court injunction that had halted Sunday's Drumcree parade, reopening the way for the Orange Order march through Portadown's Garvaghy Road.
The appeal judges also approved a new High Court hearing that night before a different judge, leaving the dispute legally active even after the ban was overturned.
The injunction had been granted after residents challenged the Parades Commission's approval, with the High Court warning the long-running dispute had potential to escalate and questioning the PSNI risk assessment.
Crowds gathered on the Garvaghy Road after the ruling, masked men blocked the road's north end, and Sinn Féin leaders condemned the decision as police prepared a major operation with about 200 officers from Scotland.
The parade would be the first on the route in almost 30 years, under limits of 35 participants, no bands or supporters, reviving a conflict that fueled some of Northern Ireland's worst 1990s disorder.