According to what I've seen on TV, the charity has done this before, but with slower cars.

They may not be able to sue the municipality or police, even though it was done on a public street, and I would think the police would have blocked off the street.

They also probably will not sue the organizers because the charity organization won't have a lot of assets.

That leaves the race team, but if it's incorporated, the assets won't mean much divided between 24 victims.