Final preparations have been made for Fatboy Slim's New Year's Day beach party in Brighton.
The 2002 party ended in chaos after 250,000 people turned up
Building of the stage in Madeira Drive began on Friday, continuing through the weekend ahead of Monday's event.
Two control centres have been set up for emergency teams, one at the site and one at John Street police station.
On Sunday, organisers said it would go ahead despite bad weather warnings. It came as New Year's Eve parties across the UK had to be cancelled.
The 20,000 tickets for the event were snapped up within five hours of going on sale in November. People without tickets have been told not to turn up.
Party in the Park
On Friday, Sussex Police said the Big Beach Boutique 3 being staged by Hove DJ Fatboy Slim, whose real name is Norman Cook, would be a safe event.
A statement issued by the force said the city had "extensive experience of hosting large outdoor events".
It said the annual Pride celebrations in Brighton attracted 120,000 to the city, the Party in the Park pop show also attracted a big crowd each year and an average sunny summer's day could bring 100,000 visitors to Brighton seafront.
A similar event by the DJ staged in 2002 ended in chaos when 250,000 people turned up instead of the 60,000 people expected.
As preparations reached their final stages over the weekend, police said the event had been planned over many weeks by a multi-agency group including the promoters, council, police, fire and rescue, coastguards, health and transport services.