The Occupy Wall Street movement traces its origin to a call to action in the Vancouver-based magazine Adbusters.

Now, Adbusters has issued a Call to Action to Occupy Chicago for the G8/NATO summit this coming May:

Hey you redeemers, rebels and radicals out there,

Against the backdrop of a global uprising that is simmering in dozens of countries and thousands of cities and towns, the G8 and NATO will hold a rare simultaneous summit in Chicago this May. The world’s military and political elites, heads of state, 7,500 officials from 80 nations, and more than 2,500 journalists will be there.

And so will we.

On May 1, 50,000 people from all over the world will flock to Chicago, set up tents, kitchens, peaceful barricades and #OCCUPYCHICAGO for a month. With a bit of luck, we’ll pull off the biggest multinational occupation of a summit meeting the world has ever seen.