The mayors of three Sydney councils have seized on a "farcical" community consultation process to launch a fresh attack on plans to raze Allianz Stadium, weeks before hard demolition works begin.

City of Sydney lord mayor Clover Moore, Waverley mayor John Wakefield and Randwick mayor Kathy Nielson claim the government breached its own guidelines for the project's community consultative committee, which is set to meet on Thursday night.

Thousands of seats at Allianz Stadium have been removed in recent days as part of "soft demolition" works. Credit:Nick Moir

The mayors wrote to Planning Minister Anthony Roberts, demanding the crucial meeting be delayed until their "serious concerns" with the community meeting process have been addressed.

But a spokesman for Mr Roberts said on Thursday afternoon that the committee had been set up "fully in accordance with the [Planning Department's] guidelines" and the meeting would go ahead.