If you are planning a trip up Toronto way (I say up because quite a few populous spots are south of Hogtown) you could be kicking yourself if you don't check into who might be playing during your stay.
This is the place to keep an eye on with so many bands, great ones and up and comers, making The Horseshoe their venue of choice.
Before your trip you should definitely check out the Rotate This website. A average to small sized record shop on Queen Street West, their website has all the info you will need.
Although The Horseshoe isn't the only spot, not in the least, there's: lee's palace, the mod club, rancho relaxo, warehouse, phoenix, and the opera house, to name a few.