This isn’t a traffic jam. It was planned, organized, coordinated and executed. The point was to shut down the city. And they did. That shut down had a cost. Time to pay up.
So you think you can sue any organization that intentionally causes you to not be able to drive on a few streets in one neighborhood of a city?
Why don't you sue Boston or New York the next time they have a marathon.
Or just sue whoever causes all that disruption when an interstate is being re-paved. They planned, organized, coordinated, and executed the plan that caused all of the drivers to sit for hours.