Metered Parking. If you come early and get lucky, metered parking is available close to PARC typically on East West streets: Erie, Ohio, Ontario, Grand. You will pay $1.25/hr. Easier on Saturdays.
W Hotel 644 N. Lake Shore Drive. One block from PARC. Three (3) hour valet parking when attending PARC sessions. I would stamp your parking coupon before you leave. Good deal for downtown Chicago. Get directions.