The plans, however, must first go through a public hearing at 2pm today, leaving less than 24 hours for them to be realised.
"Our pride is on the line," said Auckland Mayor Len Brown at an extraordinary accountability and performance committee meeting.
"Now it's time to deliver. This is the last thing the media will hear from me until Sunday - I will be buried in the detail like everyone else to make sure we get all of this right."
Party Central was unprepared to handle the 200,000 partygoers who descended on the central city on Friday night, despite years of planning.
The latest plans started to be hatched at 2am on Saturday, as authorities scrambled after the chaos on Auckland streets and transport.
The extra capacity will add up to 24,000 on the wharves - almost reaching an eighth of the crowd that turned up Friday night.
World Cup organisers are still promoting to get more people to Queens Wharf, advertising in yesterday's Herald: "If you think Queens Wharf is just for overseas guests or VIPs, think again. It's there for you too... So see you there Auckland."
They said they had no idea how many might turn up this weekend.
The applications to extend the Queens Wharf fan zone on to Captain Cook Wharf are light on detail, but contain the outlines of what to expect.
Urgent approval is sought "to secure public safety and to avoid seriously compromising the proper conduct of RWC 2011", the documents say.
Captain Cook Wharf, just east of Queens Wharf and normally used to unload and store imported cars, is estimated to have a capacity of 10,000 people. It has several existing buildings which organisers plan to use when it becomes a fan zone.
Temporary screens, food and beverage kiosks, toilets and fencing will be brought in, all with a maximum height of 8m.
A small stage is also being considered for the wharf, to "integrate" the programmed Queens Wharf music with Captain Cook Wharf. The stage will be 12m high at most.
Entry will be through Quay St, which will be closed every weekend from Lower Albert St to at least Britomart Place - and at times as far as Tinley St, about 800m away. Extra toilets will be put on the street, though it will remain liquor-free.
Silo Park, near Wynyard Quarter, is also being considered for another fan zone if Party Central continues to struggle.
On opening night, a tent was set up on Captain Cook Wharf for a private function.
The applications to the Rugby World Cup Authority were filed by the Ministry of Economic Development.
