Although West Norfolk Council has held several public exhibitions, including one earlier this week, on the Lynnsport and Marsh Lane proposals, critics say their fears about the potential impact of the scheme are not being heard.
But council officials have rejected claims that the full impact of the scheme is not being properly considered.
The weekend session, which will take place at the Beulah Street scout hut between 2 and 4pm on Saturday, has been organised by the Lynnsport Area Residents’ Association (LARA).
The group, which opposes the development, has been delivering leaflets to residents in the area ahead of the event.
North West Norfolk MP Henry Bellingham, local councillors and other politicians have been invited to attend the session.
The association argues that a proposed link road from Edward Benefer Way through the site would have a “devastating” effect on the area.
They say they also want to protect green open spaces that they claim will be lost if the project goes ahead.
A post on the group’s Facebook page said: “We need to spread the message as there are many people in the community who are still unaware of the development that will turn Lynnsport Leisure Park into tarmac, concrete and houses and with it noise, dust and air pollution.
“If you enjoy using the park to relax and play with your children this will affect you.
“Come and make a stand and show the borough council that we want to keep it as a park.”
But the borough council maintains it will create new open spaces as part of the project, while work to protect the River Lane sports pitches from development is continuing.
And, speaking at the borough council’s latest exhibition of plans for the area on Monday, project officer Dale Gagen said visitors were now reacting more positively to their ideas.
On the link road, he said: “More people are saying it’s going to be a great benefit.”
The exhibition, which was held in Lynnsport’s Wembley room, was intended to set out plans for the Lynnsport 3 site before a planning application is submitted.
A similar display, outlining plans for the Marsh Lane land, took place at the same venue earlier this month, following the submission of a planning application for that site.
And officials expect details of the next part of the scheme, covering the Lynnsport 4 and 5 sites, which lie on either side of Greenpark Avenue, to go on public display in the autumn.
Former borough councillor John Loveless, who attended the exhibition, said he hoped anything that is built on the site would enhance the view for residents who already live in the area.
But LARA representatives have claimed that considering each of the sites individually fails to properly take the effect of the whole development into account.
However Mr Gagen said: “Logistically, we just can’t carry forward an application of that size in one stage. I certainly can’t.”