An anti-war protest in the city in 2010 led to a series of clashes between police and protesters Demonstrators have gathered in Brighton for an early May Day “street party and protest”.
Under the banner Brighton Mayday collective, about 50 people have gathered at the seafront near the West Pier, Sussex Police said.
Prior to the event, officers had called on the organisers to come forward and speak to them.
A similar May Day protest in the city two years ago led to a series of clashes between police and protesters.
The protesters announced the location at 1130 BST of the start of the protest on social networking sites.
In a press release, the organisers said the event brought together local groups including Brighton Anarchist Black Cross, Smash EDO, Squatter Networks of Brighton and Brighton Hunt Saboteurs.
It said May Day was a time to “stand up for workers’ rights and resist oppression”.
Sussex Police said the force could not advise which areas of the city to avoid but it did anticipate disruption.
On Thursday, Ch Supt Graham Bartlett said without contact with the protesters, policing the event would be harder.
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