from their Facebook event:

We’re making a change: your food not only tastes better, it is better. To celebrate, we’re inviting you to bring this invitation to a participating U.S. Starbucks store to enjoy a FREE pastry* from opening** until 10:30am on July 21st, 2009 with the purchase of any beverage*.

Click to print your invitation:
http://www.starbucks.com/retail/print_free_pastry.html

Or open this page in a mobile device and show your barista:
http://www.starbucks.com/FreePastryDay

* Pastries included in offer are: Muffins, Scones, Bagels, Croissants, Rolls, Breads, Pound Cakes, Morning Bun, Coffeecakes, Cheese Danish, Apple Fritter, Doughnuts, Tarts, Pies, Gluten Free Orange Valencia Cake, Tropical Paradise Bar.

Offer available at participating U.S. stores with the purchase of any handcrafted beverage (handcrafted, brewed, iced). Limit one free pastry per customer. Offer good between opening and 10:30 a.m. or until pastries are gone, whichever comes first. Opening hours and pastry selection vary. Supplies are limited. Offer not valid in Hawaii, airports and travel plazas or at Barnes & Noble cafes. Starbucks reserves the right to cancel, amend or revoke the offer at any time due to business considerations or circumstances beyond its control. Starbucks is not responsible for errors, omissions, malfunctions, interruptions, deletions, delays or failures of operations. Void where prohibited, taxed or restricted. Cannot be combined with other offers or discounts. Cash value 1/20 cent. Not valid if photocopied, altered or reproduced. Barista, please ring discount code 563. Our new food is not yet available everywhere; ask your barista for details. **For 24 hours stores – opening is 4 a.m.