This happened to me in SF. It was pride parade day, and I parked in a perfectly legal spot. But when I came back a couple of hours later all the cars had been

This happened to me in SF. It was pride parade day, and I parked in a perfectly legal spot. But when I came back a couple of hours later all the cars had been towed and there were a bunch of special event vehicles parked there. The cops had put up a special event no parking notice, but by law that has to be done 48 hours in advance. They didn't tow me to another spot like this, though. Just towed me to impound where I had to pay about $500 to get my car back.