A discussion about Peet's free coffee from 1-3 during the month of April made me check the website to see the details.
All Peets & the Online store have specials. Most locations have complementary coffee from 1-3. Check the links (pdf files) for a calandar on your region ... Bay Area, SO Cal, Other locations.
Also on Friday's in April a free 1/4 pound of coffee comes with any purchase (check your local store to see if they participate).
There are coffee demos and other things going on.
There's a special anniversary blend and an anniversary sampler that can be ordered on line.