Yes, today is National Grammar Day. According to Wikipedia, “National Grammar Day is celebrated in the United States on March 4. Designated in 2008, the National Grammar Day was established by Martha Brockenbrough, the founder of the Society for the Promotion of Good Grammar.
There isn’t any official or traditional way to celebrate but if you look around the web, there are suggestions. Personally, I’ll be happy if you make an effort to use good grammar in your speech and in your written works. Need Help? Check out these sites and books. Oh, one more thing. If someone asks you for help with their grammar or spelling, by all means, please help them. But please don’t take it upon yourself to go around correcting people’s speech, business signs, etc. That’s just rude.
Moi, of course
http://grammar.quickanddirtytips.com/ – I subscribe to their newsletter.
Painless Grammar by Rebecca S. Elliott – I read this and it’s wonderful. The style is easy and chatty and the explanations are clear and simple.
*Please note: I do not have personal experience with all of these sites or books. If you do, please share your experiences in a comment on this post or send me an email.