In an attempt to get people to do weird things in public, Hoodie-Hoo day was established as a holiday. This wacky day of abject zaniness requires that people drop what they're doing, head out onto the street, and yell "Hoodie Hoo!" at high noon. Apparently, this random noise is supposed to scare winter away and prepare for spring, which is exactly one month away. People with throat conditions can still paricipate in today's celebration, albeit with a whistle or some other kind of noise maker.
Of course, this is only applicable if you live above the Equator. Anyone below it is having summer right now, and lord knows what saying "Hoodie Hoo" in summer might do.