Well, they don't really "do" flea markets in Canada. The few that we have are poor, and only around in the summer. So everything like that's a novelty to me.
The "Flea market" in my hometown is a Stockyard. IE. They exchange cattle and such. There's also farmers with fruits, but very few other vendors. 1 guy selling flags, 2 people with the socks/workwear stuff, a few craft vendors, and that one beanie baby guy. Nothing like the fleas you have in the US