Check your email for the offer below. Maybe YMMV/Targeted.
Make a purchase from 5/19/17 – 5/21/17 and receive a coupon for a free handcrafted beverage to be redeemed at a participating Starbucks® store. Must pay with your registered Starbucks Card/App. Your coupon will automatically be loaded to your account within 24 hours of a qualifying purchase. Coupon good for 7 days from load onto account. Excludes alcohol and Starbucks Card purchases. Not available for online purchases. This offer is exclusive to you and this Starbucks Rewards™ account, and cannot be reproduced, transferred or used by anyone else. Coupon may be redeemed once.
http://ebm.e.starbucks