The theme of this year's Butter and Eggs Day Parade is "Happy Birthday, Petaluma" as the city of Petaluma recognizes its 150th birthday. The Butter and Eggs Days Parade, now in its 27th year, celebrates Sonoma County's agricultural roots and Petaluma's rich history. The parade features several thousand locals lining the dozen blocks the parade route travels through the recently revitalized historic downtown Petaluma.