Hut Rewards members can claim the freebie by visiting www.pizzahut.com/gradparty and signing into their account to get a digital coupon, while supplies last, that can be redeemed for a free medium, one-topping pizza (hand-tossed, pan, or thin crust). The coupon can be redeemed through June 4, 2020.
The promotion runs through May 28, 2020 or until they've given out 500,000 coupons. You don't actually have to be a class of 2020 graduate to claim the coupon.
Photo via Pizza Hut.