Since this is spring break, I'm not in school and am wearing blue. Friday was when we were supposed to shield ourselves with green. I wore a very dark green shirt. That way I wouldn't be all obnoxious-looking (those springy clover antennae, c'mon) and stupid to have "gotten the day wrong" and wouldn't get pinched by obnoxious people. How smooth am I?
...On the subject of "making it an official holiday" which will eventually be brought up, I think taking the day off defeats the purpose and would eliminate the tradition of pinching people. You'd be at home instead of school or work, and so would your friends and colleagues--you're either go have a party at which no one would be caught dead not in green, or not see anyone at all.