Oh no. Another "Day".
"It was promoted in 2008 by Martha Brockenbrough, founder of the Society
for Promotion of Good Grammar."
Here she is, author of books, mainly for children and YAs:

http://martha-brockenbrough.squarespace.com/about https://en.wikipedia.org/wiki/Martha_Brockenbrough

And here's something about NGD. It appears that Mignon Fogarty ("Grammar
Girl") is also involved.

https://www.quickanddirtytips.com/national-grammar-day https://www.grammarly.com/blog/a-brief-history-of-national-grammar-day/

As you can see, the concept of "grammar" here is disappointingly
old-school.
Crystal recognizes this, and spends the rest of the page talking about
how important (real) grammar is. Language is more than just words.

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