Several thousand Apprentice Boys and dozens of bands have marched through Londonderry city centre.
The organisation had been involved in ongoing mediation talks
The Lundy's Day march commemorated the shutting of the gates during the Siege of Derry 319 years ago.
Police said Saturday's event had been quiet. In the past, traders complained the demonstration affected business, however, they were urged to stay open.
The anniversary is on 18 December - one of the peak Christmas shopping days - but the event was brought forward.
The Apprentice Boys have been involved in ongoing talks with Derry's chamber of commerce as well as residents from the Bogside.
There have been relatively few problems in recent years, and all sides want this to continue.
Police warned they would take action against troublemakers and seize alcohol.