Officials said the owner or party organizer hired security to park the cars.
A neighbor told CP24 that other people were watching to make sure attendees were not filming the large gathering on their phones.
The organizer also erected barriers above the fence in the backyard of the house so that people could not see inside.
A video posted to social media showed numerous vehicles parked on the grass near the property.
Police said it took about an hour, until around midnight, to break up the party and send everyone home.
A spokesperson for Brampton Mayor Patrick Brown said the owner has been charged under the Emergency Preparedness and Emergency Preparedness Act.
He noted that there were other parties in the city on Saturday as well, and several owners were also charged under the law.
Brown told CTV News Toronto he feels like those who attended the parties don’t realize the pandemic is not over.
It’s really irresponsible, Brown said.
Under Ontario emergency rules, gatherings in Peel Region are limited to ten people, with physical distance between members of different households.
The parties have been blamed for dozens of recent COVID-19 infections in the Ottawa area.