It's about the 1999 WTO Ministerial Conference protests in Seattle. These protests were large - scale and involved various groups expressing their concerns over globalization, trade policies, and the impact on labor, the environment, etc.
Well, the initial marches were a big part of it. People from all walks of life came out to march against the WTO. Then, as the situation escalated, the police started making arrests. There were also impromptu speeches and discussions among the protesters about how to better oppose the WTO's policies. And the presence of international media added to the significance of the events, as it brought global attention to the issues being protested in Seattle.
It's not based on a true story. It's likely a work of imagination or inspired by various fictional elements. The plot and characters are crafted for entertainment purposes rather than being rooted in reality.