Saturday's march, which starts at 11am in Market Place, has been cleared with police who will be watching over proceedings.
East council has refused to reveal details of its partnership deal with the developers despite requests under freedom of information legislation.
The council said it could not yet confirm who would be carrying out the study, how much it would cost, and how long it was likely to take, as these details had not yet been finalised.
Beverley added: "Public concern about the development has been heightened further by the fact that Cheshire Nike Air Max 90 Mens 2016
"It's clearly in the public interest for us to know if the council is exposing itself to financial or other risk, yet the missing sections include the details on financial implications, legal implications, and risk assessment.
A protest march against the plan by campaign group Wake Up Macc is still set to go ahead this Saturday, despite the delay.
Coun Jones said: "This planning application is too important to rush and get wrong.
The Express reported last week how the council's Air Max 90 Leather Pa leader, Michael Jones, commissioned the independent retail assessment after calls from campaigners and the town's MP for more up to date data.
for the people of Macclesfield."
"Worryingly, the council has even covered up wording relating to car parking and to fears the development will pull people away from the traditional heart of the town."
But this has now been cancelled because bosses say they need more time for the retail assessment to be completed and the results submitted to councillors sitting on the board.
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