I've said it already, although I'm not sure if it was on here or not:
I'm done being nice to stupid people who endanger others.
Take down their names, driver's licence numbers and a picture (easiest would be to take a pic while they hold the D/L next to their face).
Inform them that if they choose to join the large public gathering in violation of the law that they have then forfeited their right to get hospital care.
If they get seriously sick, God can heal them. Or they can die.