Campaigners are going to the Labour Party conference in Brighton to highlight a 58-year wait for the South Downs to be given National Park status.
The South Downs National Park Inquiry formally closed in March
The Downs, in Sussex and Hampshire, were recommended for protection alongside 11 other areas in 1947.
It remains the only one of those 12 landscapes which has still not been recognised by the government.
The South Downs Campaign were meeting local politicians on Saturday to call for National Park status to be applied.
Fliers about the South Downs Campaign will be distributed among delegates at the conference, which begins on Sunday.
The South Downs National Park Inquiry formally closed in March, with the inspector expected to publish his report by the end of 2005.
The campaign has the backing of Brighton Pavilion MP David Lepper and Brighton Kemptown MP Des Turner.
"We have already waited more than 50 years for this decision and I am keen that we don't have to wait another year before this is resolved," said Mr Turner.
Mr Lepper said there is "strong support" for the campaign in his constituency.
"I hope the government will make a speedy decision soon after the inspector's report is received," he said.