Cities around the world took place in the Global Marijuana March on Saturday, including in Ottawa -- where supporters for pot legalization began at Confederation Park in Ottawa's downtown and wound up at Parliament Hill.

Up to 300 cities will mark this day. In Canada, Marc Emergy -- Canada's so-called "prince of pot" -- presided over the Toronto event. His supporters are fighting his extradition to the United States for a drug sentence.

Supporters also marshalled resources on Twitter and Facebook to drum up support for the event, which was expected to draw 20,000 people in Toronto -- the largest Canadian crowd this year.

In a YouTube video last month, Stephen Harper said he didn't support the drive to legalize it.

"I guess as a parent, this is the last thing I want to see from my kids," Harper said. "I don't meet many people who've led a drug-free life that regret it. And I've met a lot that haven't, and regretted it."

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