The Labour Party is holding this year's conference at the Brighton Centre
About 1,000 homes and businesses will be affected by security and policing arrangements for this year's Labour Party conference in Brighton.
Sussex Police and Brighton council have written to all who will be affected.
During the conference, officers will visit households and companies nearby to confirm identities of people there.
Supt Grenville Wilson said that hosting the conference at a time of international tension inevitably involved heightened security.
But he said: "We are keen to stress that there is no specific threat to the conference."
Brighton and Hove City Council leader Mary Mears said the conference would bring 20,000 people and £10m to the city.
She said that was money local businesses desperately needed to help fight the recession.
"So while there is inevitably some disruption it is still worth the effort for the benefits it brings to the local economy," she added.
During the event from 27 September to 1 October, officers will seal off the area around the Brighton Centre, Hilton Metropole and Grand hotels and Russell Road NCP car park to form a secure "island" site.