If you're thinking about Crayola, you're correct. They do celebrate today, and they do so in a variety of ways. We'll help you out, don't worry.
Discount codes. Crayola offers 20% off their whole website in celebration of creativity. If you are in a similar field (art & crafts products/creation) we suggest doing the same. Particularly because in the middle of the school year, parents will replenish their kid's supplies so they have what they need to become successful.
Introduce a new color. If you have named crayons (bearing Crayola in mind), why don't you work with your marketing team to introduce a new color? Use a Wave template to create an aesthetically pleasing video packed with powerful content.
Hashtags to use today: #NationalCrayonDay, #CrayonDay, #NationalDays, #{NameofFavoriteColorCrayon}, #Crayons, #Drawing, #Coloring, #StayInTheLines, #AdultColoring, #ColoringForAdults, #MeditativeColoring.