ChangeCampTO will take place at the MaRS Centre, in the auditorium and its surroundings.

For a map and directions to MaRS, please see this page.  Please note that the map shows the future footprint of the MaRS Centre, part of which is still a construction zone for Phase II:  today MaRS occupies only the north and east part of the city block shown, so that's where to go.  The simplest way is to avoid the old building in the centre (entrance on College, in the middle of the block) and go directly to the shiny new building to its east (entrance also on College, at the east end of the block), but if you find yourself in the old building, no problem as the buildings are joined.

Once inside MaRS, make your way to the southeast corner (on the map this is below the green P-in-a-circle parking symbol) and go to the lower level (there is an escalator there).  The registration area will likely be a large open space right outside the auditorium, where you should see people milling about.