On March 14, Starbucks Rewards members can enjoy a buy one, get one free offer on handcrafted drinks from 12pm to 6pm. This deal can be claimed in the Starbucks app. If you're not already a Starbucks Rewards member, you can join for free and download the app to access this and other rewards 

Attention all Starbucks lovers! Today, March 14th, Starbucks is treating its Rewards members to a fantastic BOGO deal! From 12 p.m. to 6 p.m., all Starbucks Rewards members can enjoy buy one, get one free on handcrafted drinks.
If you're not already a member, don't worry! Joining Starbucks Rewards is quick, simple, and completely free. You can sign up in person at any Starbucks location, through the Starbucks mobile app, or via the Starbucks website.