I went here two years in a row. The first year was freezing cold out, but the weather was better the second time. That has an effect (on me anyway) how long you want to stay. This event is spread out all around the city, which makes it great for wandering with friends or on a date. The exhibits change every year, so you never know what you're gonna get. Go with a plan, or plan as you go - either way is great. Some areas (e.g., Yonge/Dundas) get super busy, so it can get tricky to wander with bigger groups.