Just announced by MGM Resorts:
"As a local Nevada resident, our self-parking will continue to be complimentary to you through December 29, 2016, with the presentation of a valid Nevada driver’s license. To extend complimentary parking beyond that date, you may choose to participate in M life Rewards, the loyalty program of MGM Resorts. Once you achieve Pearl tier status, self-parking is complimentary. Gold, Platinum and NOIR M life Rewards members also receive complimentary valet parking."