Free Doughnut at Krispy Kreme

Well, guess who else is offering a free doughnut tomorrow?  Krispy Kreme!  Yep, stop by participating locations to get a free doughnut (no purchased required) tomorrow Friday 6/3.  I could not find a list of participating locations but Krispy Kreme shared about this promo to its Facebook fans.

Also, do you write Donuts or doughnuts and why is there a difference?

Thanks, Benz1968!