The 20th.
The Equinox. Day and night are both (almost) 12 hours, the Sun rises due East and sets due west, regardless of where you are on Earth. You can balance an uncooked egg on it's end today. (Actually, you can do this on any day, but this myth persists.)
The First Day of Spring. Grass, green, gone will be the dirty grey ice/snow mounds.
The Full Supermoon. (but you probably wouldn't notice the slightly larger moon. For some unexplained reason, there is a phenomenon where the Moon appears larger near the horizon than it does overhead, yet it is farther away.
Powerball is about USD$550,000,000. (or a gimme now cash out worth 335 million.) Figure 50% to a lawyer, a financial advisor, Uncle Sam, and 30 other Uncles you didn't know you had. You also have much better odds of being opening day pitcher for the New York Yankees.
And I'm over 2,000 days without a cig!!!
Good to be Halon©.