Toronto is a generally safe city. However, as with any other large city, one should take normal personal safety precautions. Be aware of your surroundings and keep an eye on your belongings as pickpocketing can occur in the busier parts of the city.
Sporting events in Canada can experience some drunken crowds, with occasional violence. While attending sporting events beware of large and rowdy crowds. Behaving in a reasonable manner without confrontation should prevent any issues from arising.
For more tips and preparedness please consult the City of Toronto's Public Safety & Alerts webpage. For more information regarding general public safety concerns in Canada, please visit the website of Public Safety.