From the website of Grammar Girl: Quick and Dirty Tips for Better Writing
Language is something to celebrate, and March 4 is the perfect day to do it. It's not only a date, it's an imperative: March forth on March 4 to speak well, write well, and help others do the same!
For more information and fun Grammar Day activities visit http://nationalgrammarday.com/
And just for fun...
"Ending a sentence with a preposition is something up with which I will not put.”
Humor trumps grammar any day.