Yes, QuickStart is the way to ski for free at PCMR on the day you fly in. Also works at Deer Valley and Canyons. But only PCMR has lights.
You have to sign up in advance online and print out the voucher. Then take that with a boarding pass to a lift ticket window. For Southwest you must print a second boarding pass to bring along. Note that there are blackout dates.
The time I used Quickstart, my ski buddy and I got to PCMR around 1:00. Got in a few runs mid-mountain before that lift shut down and the only trails left were the ones with lights. Still, coming from the flatlands it was worth driving over from the airport. We stayed in the city that trip.