Established in 2008 by Martha Brockenbrough, founder of the Society for the Promotion of Good Grammar (SPOGG), March 4th is the official annual date for annoying impressing your friends and family with facts about grammar and usage. Also, there’s tons of fun to be had (provided you’re of the “splitting infinitives is fun” camp) on the National Grammar Day website.

This year’s National Grammar Day is hosted by Mignon Fogarty, the author of the New York Times best-selling book Grammar Girl’s Quick and Dirty Tips for Better Writing. The Grammar Girls have recorded a theme song for the day as well, playing on the “March forth/fourth” idea with questionable results. (It is kind of catchy, though, in an earwormy, science-can’t-explain-that way).

If your idea of a good time is diagramming sentences or being an Internet grammar Nazi, it’s the best day of the year for you. March forth (har) to NationalGrammarDay.com and find a few ways to celebrate.