Do you prefer to write mysteries or romances, thrillers or fantasies, science fiction or historical fiction? Whatever genre you prefer to write, I'm sure you can find a way to include one of the goofy holidays that occur in March in your story. It will add a bit of something different to your story.
Will you go to the circus on Barnum & Bailey Day? Are you going to be brave and try to eat some dandelions on Weed Appreciation Day? Will everything you eat be on a stick on Something on a Stick Day?
Barnum & Bailey Day - This holiday does exist, but I can't seem to find out exactly what it celebrates or why. I'm not a genius, but it should have something to do with the Barnum & Bailey Circus. It could have to do with the creation of the circus, it could have to do with when it was sold to the Ringling Brothers, it could have to do with one of the acts that performed.
Do some research on the Barnum & Bailey Circus, and write an historical fiction story or novel. Your main character could be a performer in one of the very first circus shows.
Or you could write a mystery/thriller. Every circus has at least one clown. I know clowns are supposed to be funny, but for some reason, I associate clowns more with terror and fear.
Weed Appreciation Day - If you garden, you probably don't have much appreciation for weeds. Your goal is most likely to kill them because to you they are only a pest, not beneficial at all.
Dandelions are a weed that is present in just about everyone's yard. This 'weed' has saved people from starvation before. Contained within raw dandelion greens are a multitude of vitamins needed by our bodies. Many other plants that we consider to be weeds are also edible and full of vitamins. Wildlife will feast on them, and if you allow weeds to grow in your yard, deer and other animals will be attracted to your yard for you to watch and enjoy.
On this day appreciate the weeds that want so badly to thrive in your yard and allow them to bloom.
Write an anthropomorphic story, one where dandelions, milkweed, and other plants considered to be weeds are your main characters.
Something on a Stick Day - I wonder what the first food to be eaten on a stick was. It could have been sweet, yummy marshmallows or it could have been hot dogs. Anyway, this day is in honor of foods that are eaten on a stick.
Today you need to eat food on a stick. If you don't want to pick a stick up from your yard to use, a toothpick will suffice. It is just a tiny stick.
The creator of this day isn't known, so why not write a story about exactly why this holiday was created?