Since last year I have been pressing Ontario for answers about if or when they will exercise their section 83 Criminal Code powers to legalize amateur MMA and other non-Olympic combat sports.
Ontario has finally provided a substantive reply and the Province advises that they plan on legalizing amateur MMA along with many other combat sports. Specifically Steve Harlow of Ontario’s Ministry of Tourism, Culture and Sport has advised that:
For the purposes of Section 83 of the Criminal Code, the Ministry of Tourism, Culture and Sport proposes that the following amateur combative sports be designated:
– boxing
– jiu jitsu
– judo
– karate
– kickboxing
– mixed martial arts
– taekwondo
– wrestling
– wushu
You can find a copy of Harlow’s full letter here which seeks feedback from all interested in the Combat Sports community:
Ontario Amateur Combat Sports Proposed Action
The Ministry is seeking stakeholder feedback until December 8 and the formal regulations are expected shortly thereafter.
Combat Sports Law 
So it’s safe to say that with the publication of this letter from the provincial government that amateur MMA is currently illegal in Ontario and until they receive feedback from informed stakeholders current organisations putting on shows in Ontario right now could be putting people and this change at risk by breaking the law just to make a few bucks.
Michael, thanks for your comment. You are correct that amateur MMA is currently illegal in Ontario as the proper framework does not yet exist for such events to comply with s. 83 of the Criminal Code.