No Day but Today! Take a look at https://nationaltoday.com/what-is-today/ (and scroll up to the top to the Month tab; use that for navigation.)
In Tesserae’s 2015 book, their staff covered Sept. 29’s National Coffee Day with an infographic and three quotes from coffee drinkers.
March 28th is Lady Gaga’s birthday — use it as an entry point in a coverage package about students’ favorite Gaga song.
April 2 is both National Burrito Day AND National Peanut Butter & Jelly Day — do a burrito/PB&J faceoff, in a two-quote, head-to-head coverage package (“he said/she said,” we used to call it…)