This fall Ontario has seen a resurgence in COVID-19 cases, which continues to be driven by young adults.
Unfortunately, Ontario government communications has been extremely confusing and inconsistent making it difficult for people to know what the restrictions actually are.
As of Nov. 23, 2020 Toronto and Peel are in lockdown which means indoors you can only gather socially/party with your immediate household. Outdoors the limit is 10 people however social distancing must be maintained.
If you live in an Ontario region in the "red zone" category, there is a social gathering limit of 5 indoors.
Everywhere else the social gathering limit is 10 people indoors.
So - in Toronto and Peel, and realistically any "red zone" - responsible partying means no partying for now. Outside of these areas, you can gather socially party with up to 10 people.