Buy the 2015 Old Farmer's Almanac!
Well, it's really justWell, it's really just folklore. The premise is that an egg will balance on the vernal and autumnal equinox because the Sun is crossing the equator and that having the center of the Earth aligned with the gravitational pull of the Sun makes it easier to balance any object. It may be that you can balance eggs any day of the year. You may want to try it and pick a day!

Shop Wind Bells in the Almanac General Store