[tweetmeme source=”elizabethev” only_single=false]Between the Kentucky Derby and el cinco de mayo, today was destined to be a day for celebrating. I wouldn’t mind having a mint julep in one hand and margarita in the other, but then again, I’d like to be somewhat productive today. So I’ll settle for sparkling water. And sparkly nail polish. I ventured out in the Boston rain (I could use some Mexican sunshine) this morning,…