Announcing the 2018 Butter & Egg Days Parade Theme “A Parade is Hatched!” celebrating the 100th anniversary of National Egg Day held in 1918. Petaluma’s National Egg Day Parade was featured in newsreels, where floats with giant chickens boasted that Petaluma, home to six million hens laying 600 million eggs and Petaluma was proclaimed as the “Egg Basket of the World!”