Travel Expo has been held there more than once, I believe I was there just tearlier this year but I can't remember but I know I went there with a friend for that kind of thing. The walking distance is a bit too far. The taxi charges you like $40or something, the black ones and I was asking for taxi but I didn't know it was the 'expensive' one. It was only about 5 minutes away from the airport!
I believe I was there in the past with a friend but it could mean paying additional fare when on Toronto local bus. But it was for something different, maybe clothing/shoes warehouse sort of thing.