Pei Wei Asian Diner is having a special event on June 3: Every customer that comes in for their “Thai Mango Harvest Celebration” will receive a card that contains one of 3 prizes: 25 percent off Thai Mango Chicken, 50 percent off Thai Mango Chicken, or a free Thai Mango Chicken entree. Odds of getting the free entree coupon are 1 in 3. The discounts will be redeemable from June 6 through 13.