The Facebook event has called on people to protest in opposition to the city's six-week shutdown and claimed to be a broader movement of planned protests.
"Let's blow this one up and fill up the streets to show these criminals we won't give up our country and livelihoods without a fight," the event description reads.
It had more than 100 confirmed attendees and 400 expressions of interest late on Thursday evening.
If they turn up, Victoria Police said it wouldn't hesitate to hand out $1652 on-the-spot fines or arrest protesters.
"This is a completely blatant breach of the chief health officer's directions and puts Victorian lives at risk," police said.
As the number of cases grow - 471 new ones on Thursday - so too do the number of fines.
Police reported nearly 200 more people being fined by Friday morning, including a man claiming to police in Maroondah at 3.40am that he was breaching the curfew to feed his uncle's horses.
They were among 43 people fined for breaching curfew, while 51 were fined for not wearing a mask.
Thursday marked a move to tough new restrictions on workers and businesses in Melbourne, while regional Victoria officially entered stage three rules.
Premier Daniel Andrews said the harsh restrictions were the "only way" the state would drive down cases.
Deputy chief health officer Allen Cheng said if Victoria had continued on the path it started on June 25, when 20 cases were recorded, and not gone into lockdown, the state could have reached 20,000 by August 12.
He expects case numbers to drop within the next 10 days.
Meanwhile, during a marathon media conference that lasted more than 90 minutes, Mr Andrews fended off repeated questions relating to the state's botched hotel quarantine program.
Genomic testing has revealed the program could be linked to a significant number of cases, if not all cases, in Victoria's second coronavirus wave.
Metropolitan Melbourne residents are subject to Stage 4 restrictions and must comply with a curfew between the hours of 8pm and 5am.
During the curfew, people in Melbourne can only leave their house for work, and essential health, care or safety reasons.
Between 5am and 8pm, people in Melbourne can leave the home for exercise, to shop for necessary goods and services, for work, for health care, or to care for a sick or elderly relative.
The full list of restrictions can be found here.
All Victorians must wear a face covering when they leave home, no matter where they live.
People in Australia must stay at least 1.5 metres away from others. Check your state’s restrictions on gathering limits.
If you are experiencing cold or flu symptoms, stay home and arrange a test by calling your doctor or contact the Coronavirus Health Information Hotline on 1800 020 080.
News and information is available in 63 languages at sbs.com.au/coronavirus