I know that we're supposed to "beware the Ides of March" — or at least, Julius Caesar was supposed to — but doesn't celebrating it sound like more fun? Personally, I'm going to commemorate the date by taking my baby on a walk in the lovely spring weather to my polling location and register my vote for our next American "emporer." (And you should, too — with or without the baby.) Some other ideas:
Read an informative book: The 5 Best Julius Caesar Biographies for The Ides of March (Cleopatra: A Life has been on my to-read shelf for a while.)
Cook a grandiose meal: An Ides of March Dinner Party (I'm adding several of these recipes to my to-cook list, including the lentil-chestnut stew.)
Knit a dishcloth: Roman Stripe Knitted Facecloth (Always a good idea!)