I don't know who or what decides that these are "national" special days. I'm just glad they do, because it usually means great deals are coming.
7-Eleven Stores - FREE cup of coffee from 7 AM to 11 AM (medium)
Krispy Kreme - FREE cup of house blend coffee (12 oz)
Thornton's - FREE coffee from 6 AM to 2 PM (size not mentioned)
Caribou - Buy One Get One Free
Want to read a little more about National Coffee Day, check out The Washington Post blog post, here.