(via Eddplant on Tumblr) National Duck Day, June 15, is an annual national holiday celebrating ducks. Since its founding in 2012, it has achieved widespread recognition[1. 1,176 notes on tumblr as of writing] and is recognized as one of the most important holidays on the Internet Annual Calendar[2. I assume.].
You can celebrate National Duck Day by going to a pond and feeding the ducks some bread, or by baking something duck-shaped, which is a great way to celebrate other national holidays, as well. It's also appropriate to wear yellow, or a sweater with a mallard on it. It is considered grossly disrespectful to make a meal of ducks on this day.[3. I made everything in this paragraph up.]