Fan Expo is on of the bigger events to come to Toronto, I figured I would post what it is from their FAQ.

“The Expo,” as it has become known, is a playground for people of all ages who are interested in any, or all, of the 5 genres Fan Expo Canada has to offer.  Each event has its own schedule of activities unique to its industry (schedules will be made available under each event) including, but not limited to; gaming tournaments, question and answer sessions with the hottest guests in their industry, artists competition (“Sketching Duels”), workshops like special effects/make-up, portfolio reviews, a masquerade (where people dress up as their favourite character) and much more!  If that isn’t enough for your senses, there are also exhibits from major companies showcasing their latest products and the largest retailer area of its kind where you can buy that limited edition item or that something special you’ve always wanted."

You can keep up to date with the gaming aspect here.